Finding the Fourth Proportional to 8,938.29, 12,340.61 and 5,538.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,938.29 : 12,340.61 = 5,538.90 : x
2. Step 2: Convert to fraction form
   8,938.29/12,340.61 = 5,538.90/x
3. Step 3: Cross multiply
   8,938.29x = 12,340.61 × 5,538.90
4. Step 4: Simplify right side
   8,938.29x = 68,353,435.58
5. Step 5: Solve for x
   x = 68,353,435.58/8,938.29
6. Step 6: Final answer
   x = 7,647.27