Finding the Fourth Proportional to 1,510.92, 2,084.00 and 921.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.92 : 2,084.00 = 921.78 : x
2. Step 2: Convert to fraction form
   1,510.92/2,084.00 = 921.78/x
3. Step 3: Cross multiply
   1,510.92x = 2,084.00 × 921.78
4. Step 4: Simplify right side
   1,510.92x = 1,920,984.91
5. Step 5: Solve for x
   x = 1,920,984.91/1,510.92
6. Step 6: Final answer
   x = 1,271.40