Finding the Fourth Proportional to 2,086.27, 3,125.15 and 987.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.27 : 3,125.15 = 987.30 : x
2. Step 2: Convert to fraction form
   2,086.27/3,125.15 = 987.30/x
3. Step 3: Cross multiply
   2,086.27x = 3,125.15 × 987.30
4. Step 4: Simplify right side
   2,086.27x = 3,085,459.36
5. Step 5: Solve for x
   x = 3,085,459.36/2,086.27
6. Step 6: Final answer
   x = 1,478.94