Finding the Fourth Proportional to 1,557.67, 2,149.59 and 928.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.67 : 2,149.59 = 928.22 : x
2. Step 2: Convert to fraction form
   1,557.67/2,149.59 = 928.22/x
3. Step 3: Cross multiply
   1,557.67x = 2,149.59 × 928.22
4. Step 4: Simplify right side
   1,557.67x = 1,995,292.43
5. Step 5: Solve for x
   x = 1,995,292.43/1,557.67
6. Step 6: Final answer
   x = 1,280.95