Finding the Fourth Proportional to 1,510.76, 2,085.04 and 921.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.76 : 2,085.04 = 921.38 : x
2. Step 2: Convert to fraction form
   1,510.76/2,085.04 = 921.38/x
3. Step 3: Cross multiply
   1,510.76x = 2,085.04 × 921.38
4. Step 4: Simplify right side
   1,510.76x = 1,921,114.16
5. Step 5: Solve for x
   x = 1,921,114.16/1,510.76
6. Step 6: Final answer
   x = 1,271.62