Finding the Fourth Proportional to 1,451.77, 2,002.73 and 861.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,451.77 : 2,002.73 = 861.89 : x
2. Step 2: Convert to fraction form
   1,451.77/2,002.73 = 861.89/x
3. Step 3: Cross multiply
   1,451.77x = 2,002.73 × 861.89
4. Step 4: Simplify right side
   1,451.77x = 1,726,132.96
5. Step 5: Solve for x
   x = 1,726,132.96/1,451.77
6. Step 6: Final answer
   x = 1,188.99