Finding the Fourth Proportional to 1,451.38, 2,003.42 and 861.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,451.38 : 2,003.42 = 861.91 : x
2. Step 2: Convert to fraction form
   1,451.38/2,003.42 = 861.91/x
3. Step 3: Cross multiply
   1,451.38x = 2,003.42 × 861.91
4. Step 4: Simplify right side
   1,451.38x = 1,726,775.60
5. Step 5: Solve for x
   x = 1,726,775.60/1,451.38
6. Step 6: Final answer
   x = 1,189.74