Finding the Fourth Proportional to 1,165.52, 1,606.82 and 987.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.52 : 1,606.82 = 987.77 : x
2. Step 2: Convert to fraction form
   1,165.52/1,606.82 = 987.77/x
3. Step 3: Cross multiply
   1,165.52x = 1,606.82 × 987.77
4. Step 4: Simplify right side
   1,165.52x = 1,587,155.62
5. Step 5: Solve for x
   x = 1,587,155.62/1,165.52
6. Step 6: Final answer
   x = 1,361.76