Finding the Fourth Proportional to 139,612.72, 209,418.12 and 56,505.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,612.72 : 209,418.12 = 56,505.52 : x
2. Step 2: Convert to fraction form
   139,612.72/209,418.12 = 56,505.52/x
3. Step 3: Cross multiply
   139,612.72x = 209,418.12 × 56,505.52
4. Step 4: Simplify right side
   139,612.72x = 11,833,279,768.02
5. Step 5: Solve for x
   x = 11,833,279,768.02/139,612.72
6. Step 6: Final answer
   x = 84,757.89