Finding the Fourth Proportional to 2,599.48, 3,900.84 and 1,139.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,599.48 : 3,900.84 = 1,139.86 : x
2. Step 2: Convert to fraction form
   2,599.48/3,900.84 = 1,139.86/x
3. Step 3: Cross multiply
   2,599.48x = 3,900.84 × 1,139.86
4. Step 4: Simplify right side
   2,599.48x = 4,446,411.48
5. Step 5: Solve for x
   x = 4,446,411.48/2,599.48
6. Step 6: Final answer
   x = 1,710.50