Finding the Fourth Proportional to 1,510.67, 2,084.60 and 921.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.67 : 2,084.60 = 921.09 : x
2. Step 2: Convert to fraction form
   1,510.67/2,084.60 = 921.09/x
3. Step 3: Cross multiply
   1,510.67x = 2,084.60 × 921.09
4. Step 4: Simplify right side
   1,510.67x = 1,920,104.21
5. Step 5: Solve for x
   x = 1,920,104.21/1,510.67
6. Step 6: Final answer
   x = 1,271.03