Finding the Fourth Proportional to 81,981.72, 113,019.30 and 61,861.32

Step by Step Solution

1. Step 1: Write the proportion equation
   81,981.72 : 113,019.30 = 61,861.32 : x
2. Step 2: Convert to fraction form
   81,981.72/113,019.30 = 61,861.32/x
3. Step 3: Cross multiply
   81,981.72x = 113,019.30 × 61,861.32
4. Step 4: Simplify right side
   81,981.72x = 6,991,523,083.48
5. Step 5: Solve for x
   x = 6,991,523,083.48/81,981.72
6. Step 6: Final answer
   x = 85,281.49