Finding the Fourth Proportional to 1,187,025.47, 1,638,092.86 and 643,175.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,187,025.47 : 1,638,092.86 = 643,175.98 : x
2. Step 2: Convert to fraction form
   1,187,025.47/1,638,092.86 = 643,175.98/x
3. Step 3: Cross multiply
   1,187,025.47x = 1,638,092.86 × 643,175.98
4. Step 4: Simplify right side
   1,187,025.47x = 1,053,581,974,858.33
5. Step 5: Solve for x
   x = 1,053,581,974,858.33/1,187,025.47
6. Step 6: Final answer
   x = 887,581.61