Finding the Fourth Proportional to 1,422.78, 2,131.08 and 690.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.78 : 2,131.08 = 690.82 : x
2. Step 2: Convert to fraction form
   1,422.78/2,131.08 = 690.82/x
3. Step 3: Cross multiply
   1,422.78x = 2,131.08 × 690.82
4. Step 4: Simplify right side
   1,422.78x = 1,472,192.69
5. Step 5: Solve for x
   x = 1,472,192.69/1,422.78
6. Step 6: Final answer
   x = 1,034.73