Finding the Fourth Proportional to 56,685, 78,225.30 and 31,534.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,685 : 78,225.30 = 31,534.50 : x
2. Step 2: Convert to fraction form
   56,685/78,225.30 = 31,534.50/x
3. Step 3: Cross multiply
   56,685x = 78,225.30 × 31,534.50
4. Step 4: Simplify right side
   56,685x = 2,466,795,722.85
5. Step 5: Solve for x
   x = 2,466,795,722.85/56,685
6. Step 6: Final answer
   x = 43,517.61