Finding the Fourth Proportional to 120,398.88, 166,151.70 and 72,643

Step by Step Solution

1. Step 1: Write the proportion equation
   120,398.88 : 166,151.70 = 72,643 : x
2. Step 2: Convert to fraction form
   120,398.88/166,151.70 = 72,643/x
3. Step 3: Cross multiply
   120,398.88x = 166,151.70 × 72,643
4. Step 4: Simplify right side
   120,398.88x = 12,069,757,943.10
5. Step 5: Solve for x
   x = 12,069,757,943.10/120,398.88
6. Step 6: Final answer
   x = 100,248.09