Finding the Fourth Proportional to 2,139.80, 2,948.31 and 1,549.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.80 : 2,948.31 = 1,549.31 : x
2. Step 2: Convert to fraction form
   2,139.80/2,948.31 = 1,549.31/x
3. Step 3: Cross multiply
   2,139.80x = 2,948.31 × 1,549.31
4. Step 4: Simplify right side
   2,139.80x = 4,567,831.42
5. Step 5: Solve for x
   x = 4,567,831.42/2,139.80
6. Step 6: Final answer
   x = 2,134.71