Finding the Fourth Proportional to 139,887.20, 209,892.77 and 73,311.43

Step by Step Solution

1. Step 1: Write the proportion equation
   139,887.20 : 209,892.77 = 73,311.43 : x
2. Step 2: Convert to fraction form
   139,887.20/209,892.77 = 73,311.43/x
3. Step 3: Cross multiply
   139,887.20x = 209,892.77 × 73,311.43
4. Step 4: Simplify right side
   139,887.20x = 15,387,538,892.54
5. Step 5: Solve for x
   x = 15,387,538,892.54/139,887.20
6. Step 6: Final answer
   x = 109,999.62