Finding the Fourth Proportional to 1,280.96, 1,919.52 and 916.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.96 : 1,919.52 = 916.52 : x
2. Step 2: Convert to fraction form
   1,280.96/1,919.52 = 916.52/x
3. Step 3: Cross multiply
   1,280.96x = 1,919.52 × 916.52
4. Step 4: Simplify right side
   1,280.96x = 1,759,278.47
5. Step 5: Solve for x
   x = 1,759,278.47/1,280.96
6. Step 6: Final answer
   x = 1,373.41