Finding the Fourth Proportional to 78,491.43, 117,704.34 and 31,711.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,491.43 : 117,704.34 = 31,711.50 : x
2. Step 2: Convert to fraction form
   78,491.43/117,704.34 = 31,711.50/x
3. Step 3: Cross multiply
   78,491.43x = 117,704.34 × 31,711.50
4. Step 4: Simplify right side
   78,491.43x = 3,732,581,177.91
5. Step 5: Solve for x
   x = 3,732,581,177.91/78,491.43
6. Step 6: Final answer
   x = 47,554.00