Finding the Fourth Proportional to 1,417.84, 1,956.90 and 919.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.84 : 1,956.90 = 919.78 : x
2. Step 2: Convert to fraction form
   1,417.84/1,956.90 = 919.78/x
3. Step 3: Cross multiply
   1,417.84x = 1,956.90 × 919.78
4. Step 4: Simplify right side
   1,417.84x = 1,799,917.48
5. Step 5: Solve for x
   x = 1,799,917.48/1,417.84
6. Step 6: Final answer
   x = 1,269.48