Finding the Fourth Proportional to 12,457.60, 17,155.20 and 10,081.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,457.60 : 17,155.20 = 10,081.60 : x
2. Step 2: Convert to fraction form
   12,457.60/17,155.20 = 10,081.60/x
3. Step 3: Cross multiply
   12,457.60x = 17,155.20 × 10,081.60
4. Step 4: Simplify right side
   12,457.60x = 172,951,864.32
5. Step 5: Solve for x
   x = 172,951,864.32/12,457.60
6. Step 6: Final answer
   x = 13,883.24