Finding the Fourth Proportional to 1,078.92, 1,487.94 and 913.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.92 : 1,487.94 = 913.56 : x
2. Step 2: Convert to fraction form
   1,078.92/1,487.94 = 913.56/x
3. Step 3: Cross multiply
   1,078.92x = 1,487.94 × 913.56
4. Step 4: Simplify right side
   1,078.92x = 1,359,322.47
5. Step 5: Solve for x
   x = 1,359,322.47/1,078.92
6. Step 6: Final answer
   x = 1,259.89