Finding the Fourth Proportional to 1,390.76, 2,077.97 and 1,342.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.76 : 2,077.97 = 1,342.31 : x
2. Step 2: Convert to fraction form
   1,390.76/2,077.97 = 1,342.31/x
3. Step 3: Cross multiply
   1,390.76x = 2,077.97 × 1,342.31
4. Step 4: Simplify right side
   1,390.76x = 2,789,288.46
5. Step 5: Solve for x
   x = 2,789,288.46/1,390.76
6. Step 6: Final answer
   x = 2,005.59