Finding the Fourth Proportional to 1,510.89, 2,084.92 and 921.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.89 : 2,084.92 = 921.30 : x
2. Step 2: Convert to fraction form
   1,510.89/2,084.92 = 921.30/x
3. Step 3: Cross multiply
   1,510.89x = 2,084.92 × 921.30
4. Step 4: Simplify right side
   1,510.89x = 1,920,836.80
5. Step 5: Solve for x
   x = 1,920,836.80/1,510.89
6. Step 6: Final answer
   x = 1,271.33