Finding the Fourth Proportional to 71,803.34, 99,088.56 and 39,979.76

Step by Step Solution

1. Step 1: Write the proportion equation
   71,803.34 : 99,088.56 = 39,979.76 : x
2. Step 2: Convert to fraction form
   71,803.34/99,088.56 = 39,979.76/x
3. Step 3: Cross multiply
   71,803.34x = 99,088.56 × 39,979.76
4. Step 4: Simplify right side
   71,803.34x = 3,961,536,352.10
5. Step 5: Solve for x
   x = 3,961,536,352.10/71,803.34
6. Step 6: Final answer
   x = 55,172.04