Finding the Fourth Proportional to 2,601.47, 3,900.79 and 1,138.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,601.47 : 3,900.79 = 1,138.91 : x
2. Step 2: Convert to fraction form
   2,601.47/3,900.79 = 1,138.91/x
3. Step 3: Cross multiply
   2,601.47x = 3,900.79 × 1,138.91
4. Step 4: Simplify right side
   2,601.47x = 4,442,648.74
5. Step 5: Solve for x
   x = 4,442,648.74/2,601.47
6. Step 6: Final answer
   x = 1,707.75