Finding the Fourth Proportional to 2,601.31, 3,902.99 and 1,139.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,601.31 : 3,902.99 = 1,139.43 : x
2. Step 2: Convert to fraction form
   2,601.31/3,902.99 = 1,139.43/x
3. Step 3: Cross multiply
   2,601.31x = 3,902.99 × 1,139.43
4. Step 4: Simplify right side
   2,601.31x = 4,447,192.83
5. Step 5: Solve for x
   x = 4,447,192.83/2,601.31
6. Step 6: Final answer
   x = 1,709.60