Finding the Fourth Proportional to 3,686.76, 5,523.42 and 3,139.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.76 : 5,523.42 = 3,139.56 : x
2. Step 2: Convert to fraction form
   3,686.76/5,523.42 = 3,139.56/x
3. Step 3: Cross multiply
   3,686.76x = 5,523.42 × 3,139.56
4. Step 4: Simplify right side
   3,686.76x = 17,341,108.50
5. Step 5: Solve for x
   x = 17,341,108.50/3,686.76
6. Step 6: Final answer
   x = 4,703.62