Finding the Fourth Proportional to 1,401.92, 1,934.52 and 780.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.92 : 1,934.52 = 780.92 : x
2. Step 2: Convert to fraction form
   1,401.92/1,934.52 = 780.92/x
3. Step 3: Cross multiply
   1,401.92x = 1,934.52 × 780.92
4. Step 4: Simplify right side
   1,401.92x = 1,510,705.36
5. Step 5: Solve for x
   x = 1,510,705.36/1,401.92
6. Step 6: Final answer
   x = 1,077.60