Finding the Fourth Proportional to 9,139.10, 13,714.28 and 3,591.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.10 : 13,714.28 = 3,591.47 : x
2. Step 2: Convert to fraction form
   9,139.10/13,714.28 = 3,591.47/x
3. Step 3: Cross multiply
   9,139.10x = 13,714.28 × 3,591.47
4. Step 4: Simplify right side
   9,139.10x = 49,254,365.60
5. Step 5: Solve for x
   x = 49,254,365.60/9,139.10
6. Step 6: Final answer
   x = 5,389.41