Finding the Fourth Proportional to 71,661.34, 98,895.72 and 39,830.50

Step by Step Solution

1. Step 1: Write the proportion equation
   71,661.34 : 98,895.72 = 39,830.50 : x
2. Step 2: Convert to fraction form
   71,661.34/98,895.72 = 39,830.50/x
3. Step 3: Cross multiply
   71,661.34x = 98,895.72 × 39,830.50
4. Step 4: Simplify right side
   71,661.34x = 3,939,065,975.46
5. Step 5: Solve for x
   x = 3,939,065,975.46/71,661.34
6. Step 6: Final answer
   x = 54,967.80