Finding the Fourth Proportional to 10,663.60, 14,909.60 and 10,663.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,663.60 : 14,909.60 = 10,663.60 : x
2. Step 2: Convert to fraction form
   10,663.60/14,909.60 = 10,663.60/x
3. Step 3: Cross multiply
   10,663.60x = 14,909.60 × 10,663.60
4. Step 4: Simplify right side
   10,663.60x = 158,990,010.56
5. Step 5: Solve for x
   x = 158,990,010.56/10,663.60
6. Step 6: Final answer
   x = 14,909.60