Finding the Fourth Proportional to 12,861.60, 17,751.06 and 7,557.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,861.60 : 17,751.06 = 7,557.72 : x
2. Step 2: Convert to fraction form
   12,861.60/17,751.06 = 7,557.72/x
3. Step 3: Cross multiply
   12,861.60x = 17,751.06 × 7,557.72
4. Step 4: Simplify right side
   12,861.60x = 134,157,541.18
5. Step 5: Solve for x
   x = 134,157,541.18/12,861.60
6. Step 6: Final answer
   x = 10,430.86