Finding the Fourth Proportional to 13,278.33, 18,325.17 and 7,613.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,278.33 : 18,325.17 = 7,613.61 : x
2. Step 2: Convert to fraction form
   13,278.33/18,325.17 = 7,613.61/x
3. Step 3: Cross multiply
   13,278.33x = 18,325.17 × 7,613.61
4. Step 4: Simplify right side
   13,278.33x = 139,520,669.89
5. Step 5: Solve for x
   x = 139,520,669.89/13,278.33
6. Step 6: Final answer
   x = 10,507.39