Finding the Fourth Proportional to 56,631.72, 78,152.06 and 31,139.73

Step by Step Solution

1. Step 1: Write the proportion equation
   56,631.72 : 78,152.06 = 31,139.73 : x
2. Step 2: Convert to fraction form
   56,631.72/78,152.06 = 31,139.73/x
3. Step 3: Cross multiply
   56,631.72x = 78,152.06 × 31,139.73
4. Step 4: Simplify right side
   56,631.72x = 2,433,633,769.62
5. Step 5: Solve for x
   x = 2,433,633,769.62/56,631.72
6. Step 6: Final answer
   x = 42,972.98