Finding the Fourth Proportional to 1,298.88, 1,949.76 and 912.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.88 : 1,949.76 = 912.96 : x
2. Step 2: Convert to fraction form
   1,298.88/1,949.76 = 912.96/x
3. Step 3: Cross multiply
   1,298.88x = 1,949.76 × 912.96
4. Step 4: Simplify right side
   1,298.88x = 1,780,052.89
5. Step 5: Solve for x
   x = 1,780,052.89/1,298.88
6. Step 6: Final answer
   x = 1,370.45