Finding the Fourth Proportional to 1,189,980.53, 1,642,201.67 and 646,139.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,980.53 : 1,642,201.67 = 646,139.24 : x
2. Step 2: Convert to fraction form
   1,189,980.53/1,642,201.67 = 646,139.24/x
3. Step 3: Cross multiply
   1,189,980.53x = 1,642,201.67 × 646,139.24
4. Step 4: Simplify right side
   1,189,980.53x = 1,061,090,947,780.51
5. Step 5: Solve for x
   x = 1,061,090,947,780.51/1,189,980.53
6. Step 6: Final answer
   x = 891,687.65