Finding the Fourth Proportional to 1,510.56, 2,084.61 and 921.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.56 : 2,084.61 = 921.42 : x
2. Step 2: Convert to fraction form
   1,510.56/2,084.61 = 921.42/x
3. Step 3: Cross multiply
   1,510.56x = 2,084.61 × 921.42
4. Step 4: Simplify right side
   1,510.56x = 1,920,806.56
5. Step 5: Solve for x
   x = 1,920,806.56/1,510.56
6. Step 6: Final answer
   x = 1,271.58