Finding the Fourth Proportional to 1,111.14, 1,532.25 and 921.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.14 : 1,532.25 = 921.78 : x
2. Step 2: Convert to fraction form
   1,111.14/1,532.25 = 921.78/x
3. Step 3: Cross multiply
   1,111.14x = 1,532.25 × 921.78
4. Step 4: Simplify right side
   1,111.14x = 1,412,397.41
5. Step 5: Solve for x
   x = 1,412,397.41/1,111.14
6. Step 6: Final answer
   x = 1,271.12