Finding the Fourth Proportional to 1,480.40, 2,042.94 and 921.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,480.40 : 2,042.94 = 921.12 : x
2. Step 2: Convert to fraction form
   1,480.40/2,042.94 = 921.12/x
3. Step 3: Cross multiply
   1,480.40x = 2,042.94 × 921.12
4. Step 4: Simplify right side
   1,480.40x = 1,881,792.89
5. Step 5: Solve for x
   x = 1,881,792.89/1,480.40
6. Step 6: Final answer
   x = 1,271.14