Finding the Fourth Proportional to 71,984.86, 99,334.54 and 39,719.86

Step by Step Solution

1. Step 1: Write the proportion equation
   71,984.86 : 99,334.54 = 39,719.86 : x
2. Step 2: Convert to fraction form
   71,984.86/99,334.54 = 39,719.86/x
3. Step 3: Cross multiply
   71,984.86x = 99,334.54 × 39,719.86
4. Step 4: Simplify right side
   71,984.86x = 3,945,554,021.96
5. Step 5: Solve for x
   x = 3,945,554,021.96/71,984.86
6. Step 6: Final answer
   x = 54,810.89