Finding the Fourth Proportional to 1,512.16, 2,086.88 and 922.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,512.16 : 2,086.88 = 922.72 : x
2. Step 2: Convert to fraction form
   1,512.16/2,086.88 = 922.72/x
3. Step 3: Cross multiply
   1,512.16x = 2,086.88 × 922.72
4. Step 4: Simplify right side
   1,512.16x = 1,925,605.91
5. Step 5: Solve for x
   x = 1,925,605.91/1,512.16
6. Step 6: Final answer
   x = 1,273.41