Finding the Fourth Proportional to 10,861.56, 14,972.04 and 9,957.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,861.56 : 14,972.04 = 9,957.60 : x
2. Step 2: Convert to fraction form
   10,861.56/14,972.04 = 9,957.60/x
3. Step 3: Cross multiply
   10,861.56x = 14,972.04 × 9,957.60
4. Step 4: Simplify right side
   10,861.56x = 149,085,585.50
5. Step 5: Solve for x
   x = 149,085,585.50/10,861.56
6. Step 6: Final answer
   x = 13,725.98