Finding the Fourth Proportional to 1,820.55, 2,729.20 and 724.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.55 : 2,729.20 = 724.17 : x
2. Step 2: Convert to fraction form
   1,820.55/2,729.20 = 724.17/x
3. Step 3: Cross multiply
   1,820.55x = 2,729.20 × 724.17
4. Step 4: Simplify right side
   1,820.55x = 1,976,404.76
5. Step 5: Solve for x
   x = 1,976,404.76/1,820.55
6. Step 6: Final answer
   x = 1,085.61