Finding the Fourth Proportional to 71,815.69, 99,106.33 and 39,985.27

Step by Step Solution

1. Step 1: Write the proportion equation
   71,815.69 : 99,106.33 = 39,985.27 : x
2. Step 2: Convert to fraction form
   71,815.69/99,106.33 = 39,985.27/x
3. Step 3: Cross multiply
   71,815.69x = 99,106.33 × 39,985.27
4. Step 4: Simplify right side
   71,815.69x = 3,962,793,389.29
5. Step 5: Solve for x
   x = 3,962,793,389.29/71,815.69
6. Step 6: Final answer
   x = 55,180.05