Finding the Fourth Proportional to 9,371.50, 12,929.02 and 5,390.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,371.50 : 12,929.02 = 5,390.55 : x
2. Step 2: Convert to fraction form
   9,371.50/12,929.02 = 5,390.55/x
3. Step 3: Cross multiply
   9,371.50x = 12,929.02 × 5,390.55
4. Step 4: Simplify right side
   9,371.50x = 69,694,515.28
5. Step 5: Solve for x
   x = 69,694,515.28/9,371.50
6. Step 6: Final answer
   x = 7,436.86