Finding the Fourth Proportional to 1,087.71, 1,630.76 and 654.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.71 : 1,630.76 = 654.77 : x
2. Step 2: Convert to fraction form
   1,087.71/1,630.76 = 654.77/x
3. Step 3: Cross multiply
   1,087.71x = 1,630.76 × 654.77
4. Step 4: Simplify right side
   1,087.71x = 1,067,761.30
5. Step 5: Solve for x
   x = 1,067,761.30/1,087.71
6. Step 6: Final answer
   x = 981.66