Finding the Fourth Proportional to 12,376.72, 17,070.24 and 7,663.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,376.72 : 17,070.24 = 7,663.60 : x
2. Step 2: Convert to fraction form
   12,376.72/17,070.24 = 7,663.60/x
3. Step 3: Cross multiply
   12,376.72x = 17,070.24 × 7,663.60
4. Step 4: Simplify right side
   12,376.72x = 130,819,491.26
5. Step 5: Solve for x
   x = 130,819,491.26/12,376.72
6. Step 6: Final answer
   x = 10,569.80