Finding the Fourth Proportional to 1,510.69, 2,084.86 and 921.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.69 : 2,084.86 = 921.15 : x
2. Step 2: Convert to fraction form
   1,510.69/2,084.86 = 921.15/x
3. Step 3: Cross multiply
   1,510.69x = 2,084.86 × 921.15
4. Step 4: Simplify right side
   1,510.69x = 1,920,468.79
5. Step 5: Solve for x
   x = 1,920,468.79/1,510.69
6. Step 6: Final answer
   x = 1,271.25