Finding the Fourth Proportional to 1,510.59, 2,084.81 and 921.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.59 : 2,084.81 = 921.11 : x
2. Step 2: Convert to fraction form
   1,510.59/2,084.81 = 921.11/x
3. Step 3: Cross multiply
   1,510.59x = 2,084.81 × 921.11
4. Step 4: Simplify right side
   1,510.59x = 1,920,339.34
5. Step 5: Solve for x
   x = 1,920,339.34/1,510.59
6. Step 6: Final answer
   x = 1,271.25