Finding the Fourth Proportional to 71,641.91, 98,861.30 and 39,808.91

Step by Step Solution

1. Step 1: Write the proportion equation
   71,641.91 : 98,861.30 = 39,808.91 : x
2. Step 2: Convert to fraction form
   71,641.91/98,861.30 = 39,808.91/x
3. Step 3: Cross multiply
   71,641.91x = 98,861.30 × 39,808.91
4. Step 4: Simplify right side
   71,641.91x = 3,935,559,900.83
5. Step 5: Solve for x
   x = 3,935,559,900.83/71,641.91
6. Step 6: Final answer
   x = 54,933.77