Finding the Fourth Proportional to 42,899.72, 64,372.02 and 31,150.55

Step by Step Solution

1. Step 1: Write the proportion equation
   42,899.72 : 64,372.02 = 31,150.55 : x
2. Step 2: Convert to fraction form
   42,899.72/64,372.02 = 31,150.55/x
3. Step 3: Cross multiply
   42,899.72x = 64,372.02 × 31,150.55
4. Step 4: Simplify right side
   42,899.72x = 2,005,223,505.75
5. Step 5: Solve for x
   x = 2,005,223,505.75/42,899.72
6. Step 6: Final answer
   x = 46,742.11