Finding the Fourth Proportional to 9,139.55, 13,714.81 and 3,945.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.55 : 13,714.81 = 3,945.42 : x
2. Step 2: Convert to fraction form
   9,139.55/13,714.81 = 3,945.42/x
3. Step 3: Cross multiply
   9,139.55x = 13,714.81 × 3,945.42
4. Step 4: Simplify right side
   9,139.55x = 54,110,685.67
5. Step 5: Solve for x
   x = 54,110,685.67/9,139.55
6. Step 6: Final answer
   x = 5,920.50