Finding the Fourth Proportional to 12,655.71, 17,469.54 and 7,620.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,655.71 : 17,469.54 = 7,620.18 : x
2. Step 2: Convert to fraction form
   12,655.71/17,469.54 = 7,620.18/x
3. Step 3: Cross multiply
   12,655.71x = 17,469.54 × 7,620.18
4. Step 4: Simplify right side
   12,655.71x = 133,121,039.32
5. Step 5: Solve for x
   x = 133,121,039.32/12,655.71
6. Step 6: Final answer
   x = 10,518.65