Finding the Fourth Proportional to 113,839.86, 170,728.61 and 42,757.01

Step by Step Solution

1. Step 1: Write the proportion equation
   113,839.86 : 170,728.61 = 42,757.01 : x
2. Step 2: Convert to fraction form
   113,839.86/170,728.61 = 42,757.01/x
3. Step 3: Cross multiply
   113,839.86x = 170,728.61 × 42,757.01
4. Step 4: Simplify right side
   113,839.86x = 7,299,844,138.31
5. Step 5: Solve for x
   x = 7,299,844,138.31/113,839.86
6. Step 6: Final answer
   x = 64,123.80