Finding the Fourth Proportional to 1,401.52, 1,934.12 and 780.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.52 : 1,934.12 = 780.52 : x
2. Step 2: Convert to fraction form
   1,401.52/1,934.12 = 780.52/x
3. Step 3: Cross multiply
   1,401.52x = 1,934.12 × 780.52
4. Step 4: Simplify right side
   1,401.52x = 1,509,619.34
5. Step 5: Solve for x
   x = 1,509,619.34/1,401.52
6. Step 6: Final answer
   x = 1,077.13