Finding the Fourth Proportional to 2,158.18, 3,236.60 and 987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.18 : 3,236.60 = 987.50 : x
2. Step 2: Convert to fraction form
   2,158.18/3,236.60 = 987.50/x
3. Step 3: Cross multiply
   2,158.18x = 3,236.60 × 987.50
4. Step 4: Simplify right side
   2,158.18x = 3,196,142.50
5. Step 5: Solve for x
   x = 3,196,142.50/2,158.18
6. Step 6: Final answer
   x = 1,480.94