Finding the Fourth Proportional to 1,422.30, 2,134.42 and 872.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.30 : 2,134.42 = 872.81 : x
2. Step 2: Convert to fraction form
   1,422.30/2,134.42 = 872.81/x
3. Step 3: Cross multiply
   1,422.30x = 2,134.42 × 872.81
4. Step 4: Simplify right side
   1,422.30x = 1,862,938.88
5. Step 5: Solve for x
   x = 1,862,938.88/1,422.30
6. Step 6: Final answer
   x = 1,309.80