Finding the Fourth Proportional to 1,007.43, 1,510.53 and 921.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.43 : 1,510.53 = 921.48 : x
2. Step 2: Convert to fraction form
   1,007.43/1,510.53 = 921.48/x
3. Step 3: Cross multiply
   1,007.43x = 1,510.53 × 921.48
4. Step 4: Simplify right side
   1,007.43x = 1,391,925.39
5. Step 5: Solve for x
   x = 1,391,925.39/1,007.43
6. Step 6: Final answer
   x = 1,381.66