Finding the Fourth Proportional to 1,079.32, 1,488.54 and 912.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.32 : 1,488.54 = 912.08 : x
2. Step 2: Convert to fraction form
   1,079.32/1,488.54 = 912.08/x
3. Step 3: Cross multiply
   1,079.32x = 1,488.54 × 912.08
4. Step 4: Simplify right side
   1,079.32x = 1,357,667.56
5. Step 5: Solve for x
   x = 1,357,667.56/1,079.32
6. Step 6: Final answer
   x = 1,257.89