Finding the Fourth Proportional to 1,320.55, 1,980.21 and 743.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.55 : 1,980.21 = 743.42 : x
2. Step 2: Convert to fraction form
   1,320.55/1,980.21 = 743.42/x
3. Step 3: Cross multiply
   1,320.55x = 1,980.21 × 743.42
4. Step 4: Simplify right side
   1,320.55x = 1,472,127.72
5. Step 5: Solve for x
   x = 1,472,127.72/1,320.55
6. Step 6: Final answer
   x = 1,114.79