Finding the Fourth Proportional to 12,391.60, 17,105.76 and 7,612.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.60 : 17,105.76 = 7,612.33 : x
2. Step 2: Convert to fraction form
   12,391.60/17,105.76 = 7,612.33/x
3. Step 3: Cross multiply
   12,391.60x = 17,105.76 × 7,612.33
4. Step 4: Simplify right side
   12,391.60x = 130,214,690.02
5. Step 5: Solve for x
   x = 130,214,690.02/12,391.60
6. Step 6: Final answer
   x = 10,508.30