Finding the Fourth Proportional to 1,319.86, 1,821.59 and 760.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,319.86 : 1,821.59 = 760.42 : x
2. Step 2: Convert to fraction form
   1,319.86/1,821.59 = 760.42/x
3. Step 3: Cross multiply
   1,319.86x = 1,821.59 × 760.42
4. Step 4: Simplify right side
   1,319.86x = 1,385,173.47
5. Step 5: Solve for x
   x = 1,385,173.47/1,319.86
6. Step 6: Final answer
   x = 1,049.49