Finding the Fourth Proportional to 1,422.92, 2,142.77 and 1,242.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.92 : 2,142.77 = 1,242.50 : x
2. Step 2: Convert to fraction form
   1,422.92/2,142.77 = 1,242.50/x
3. Step 3: Cross multiply
   1,422.92x = 2,142.77 × 1,242.50
4. Step 4: Simplify right side
   1,422.92x = 2,662,391.73
5. Step 5: Solve for x
   x = 2,662,391.73/1,422.92
6. Step 6: Final answer
   x = 1,871.08