Finding the Fourth Proportional to 3,139.10, 4,224.82 and 3,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.10 : 4,224.82 = 3,139.10 : x
2. Step 2: Convert to fraction form
   3,139.10/4,224.82 = 3,139.10/x
3. Step 3: Cross multiply
   3,139.10x = 4,224.82 × 3,139.10
4. Step 4: Simplify right side
   3,139.10x = 13,262,132.46
5. Step 5: Solve for x
   x = 13,262,132.46/3,139.10
6. Step 6: Final answer
   x = 4,224.82