Finding the Fourth Proportional to 3,139.72, 4,710.18 and 1,265.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.72 : 4,710.18 = 1,265.76 : x
2. Step 2: Convert to fraction form
   3,139.72/4,710.18 = 1,265.76/x
3. Step 3: Cross multiply
   3,139.72x = 4,710.18 × 1,265.76
4. Step 4: Simplify right side
   3,139.72x = 5,961,957.44
5. Step 5: Solve for x
   x = 5,961,957.44/3,139.72
6. Step 6: Final answer
   x = 1,898.88