Finding the Fourth Proportional to 56,729.70, 78,288.89 and 31,238.73

Step by Step Solution

1. Step 1: Write the proportion equation
   56,729.70 : 78,288.89 = 31,238.73 : x
2. Step 2: Convert to fraction form
   56,729.70/78,288.89 = 31,238.73/x
3. Step 3: Cross multiply
   56,729.70x = 78,288.89 × 31,238.73
4. Step 4: Simplify right side
   56,729.70x = 2,445,645,340.52
5. Step 5: Solve for x
   x = 2,445,645,340.52/56,729.70
6. Step 6: Final answer
   x = 43,110.49