Finding the Fourth Proportional to 1,380.83, 2,072.29 and 731.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.83 : 2,072.29 = 731.71 : x
2. Step 2: Convert to fraction form
   1,380.83/2,072.29 = 731.71/x
3. Step 3: Cross multiply
   1,380.83x = 2,072.29 × 731.71
4. Step 4: Simplify right side
   1,380.83x = 1,516,315.32
5. Step 5: Solve for x
   x = 1,516,315.32/1,380.83
6. Step 6: Final answer
   x = 1,098.12