Finding the Fourth Proportional to 52,872.72, 72,939.20 and 31,647.90

Step by Step Solution

1. Step 1: Write the proportion equation
   52,872.72 : 72,939.20 = 31,647.90 : x
2. Step 2: Convert to fraction form
   52,872.72/72,939.20 = 31,647.90/x
3. Step 3: Cross multiply
   52,872.72x = 72,939.20 × 31,647.90
4. Step 4: Simplify right side
   52,872.72x = 2,308,372,507.68
5. Step 5: Solve for x
   x = 2,308,372,507.68/52,872.72
6. Step 6: Final answer
   x = 43,659.05