Finding the Fourth Proportional to 1,320.12, 1,821.78 and 760.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.12 : 1,821.78 = 760.50 : x
2. Step 2: Convert to fraction form
   1,320.12/1,821.78 = 760.50/x
3. Step 3: Cross multiply
   1,320.12x = 1,821.78 × 760.50
4. Step 4: Simplify right side
   1,320.12x = 1,385,463.69
5. Step 5: Solve for x
   x = 1,385,463.69/1,320.12
6. Step 6: Final answer
   x = 1,049.50