Finding the Fourth Proportional to 917,321,870.10, 1,287,878,588.70 and 917,321,870.10

Step by Step Solution

1. Step 1: Write the proportion equation
   917,321,870.10 : 1,287,878,588.70 = 917,321,870.10 : x
2. Step 2: Convert to fraction form
   917,321,870.10/1,287,878,588.70 = 917,321,870.10/x
3. Step 3: Cross multiply
   917,321,870.10x = 1,287,878,588.70 × 917,321,870.10
4. Step 4: Simplify right side
   917,321,870.10x = 1,181,399,195,448,032,768
5. Step 5: Solve for x
   x = 1,181,399,195,448,032,768/917,321,870.10
6. Step 6: Final answer
   x = 1,287,878,588.70