Finding the Fourth Proportional to 1,125,978.88, 1,553,464.82 and 642,196.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,125,978.88 : 1,553,464.82 = 642,196.12 : x
2. Step 2: Convert to fraction form
   1,125,978.88/1,553,464.82 = 642,196.12/x
3. Step 3: Cross multiply
   1,125,978.88x = 1,553,464.82 × 642,196.12
4. Step 4: Simplify right side
   1,125,978.88x = 997,629,079,960.50
5. Step 5: Solve for x
   x = 997,629,079,960.50/1,125,978.88
6. Step 6: Final answer
   x = 886,010.47