Finding the Fourth Proportional to 12,353.78, 18,517.39 and 5,337.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,353.78 : 18,517.39 = 5,337.10 : x
2. Step 2: Convert to fraction form
   12,353.78/18,517.39 = 5,337.10/x
3. Step 3: Cross multiply
   12,353.78x = 18,517.39 × 5,337.10
4. Step 4: Simplify right side
   12,353.78x = 98,829,162.17
5. Step 5: Solve for x
   x = 98,829,162.17/12,353.78
6. Step 6: Final answer
   x = 7,999.91