Finding the Fourth Proportional to 12,345.60, 17,019.36 and 7,627.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,345.60 : 17,019.36 = 7,627.20 : x
2. Step 2: Convert to fraction form
   12,345.60/17,019.36 = 7,627.20/x
3. Step 3: Cross multiply
   12,345.60x = 17,019.36 × 7,627.20
4. Step 4: Simplify right side
   12,345.60x = 129,810,062.59
5. Step 5: Solve for x
   x = 129,810,062.59/12,345.60
6. Step 6: Final answer
   x = 10,514.68