Finding the Fourth Proportional to 9,354.47, 12,909.20 and 5,105.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,354.47 : 12,909.20 = 5,105.57 : x
2. Step 2: Convert to fraction form
   9,354.47/12,909.20 = 5,105.57/x
3. Step 3: Cross multiply
   9,354.47x = 12,909.20 × 5,105.57
4. Step 4: Simplify right side
   9,354.47x = 65,908,734.17
5. Step 5: Solve for x
   x = 65,908,734.17/9,354.47
6. Step 6: Final answer
   x = 7,045.70