Finding the Fourth Proportional to 1,148.42, 1,585.42 and 921.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,148.42 : 1,585.42 = 921.89 : x
2. Step 2: Convert to fraction form
   1,148.42/1,585.42 = 921.89/x
3. Step 3: Cross multiply
   1,148.42x = 1,585.42 × 921.89
4. Step 4: Simplify right side
   1,148.42x = 1,461,572.61
5. Step 5: Solve for x
   x = 1,461,572.61/1,148.42
6. Step 6: Final answer
   x = 1,272.69