Finding the Fourth Proportional to 56,729.50, 78,286.71 and 31,578.46

Step by Step Solution

1. Step 1: Write the proportion equation
   56,729.50 : 78,286.71 = 31,578.46 : x
2. Step 2: Convert to fraction form
   56,729.50/78,286.71 = 31,578.46/x
3. Step 3: Cross multiply
   56,729.50x = 78,286.71 × 31,578.46
4. Step 4: Simplify right side
   56,729.50x = 2,472,173,740.27
5. Step 5: Solve for x
   x = 2,472,173,740.27/56,729.50
6. Step 6: Final answer
   x = 43,578.27