Finding the Fourth Proportional to 1,380.82, 2,070.47 and 731.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.82 : 2,070.47 = 731.38 : x
2. Step 2: Convert to fraction form
   1,380.82/2,070.47 = 731.38/x
3. Step 3: Cross multiply
   1,380.82x = 2,070.47 × 731.38
4. Step 4: Simplify right side
   1,380.82x = 1,514,300.35
5. Step 5: Solve for x
   x = 1,514,300.35/1,380.82
6. Step 6: Final answer
   x = 1,096.67