Finding the Fourth Proportional to 1,189,261.71, 1,641,128.72 and 679,997.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,261.71 : 1,641,128.72 = 679,997.43 : x
2. Step 2: Convert to fraction form
   1,189,261.71/1,641,128.72 = 679,997.43/x
3. Step 3: Cross multiply
   1,189,261.71x = 1,641,128.72 × 679,997.43
4. Step 4: Simplify right side
   1,189,261.71x = 1,115,963,308,499.20
5. Step 5: Solve for x
   x = 1,115,963,308,499.20/1,189,261.71
6. Step 6: Final answer
   x = 938,366.47