Finding the Fourth Proportional to 1,379.52, 1,902.24 and 912.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.52 : 1,902.24 = 912.96 : x
2. Step 2: Convert to fraction form
   1,379.52/1,902.24 = 912.96/x
3. Step 3: Cross multiply
   1,379.52x = 1,902.24 × 912.96
4. Step 4: Simplify right side
   1,379.52x = 1,736,669.03
5. Step 5: Solve for x
   x = 1,736,669.03/1,379.52
6. Step 6: Final answer
   x = 1,258.89