Finding the Fourth Proportional to 3,451.38, 5,172.96 and 1,987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,451.38 : 5,172.96 = 1,987.50 : x
2. Step 2: Convert to fraction form
   3,451.38/5,172.96 = 1,987.50/x
3. Step 3: Cross multiply
   3,451.38x = 5,172.96 × 1,987.50
4. Step 4: Simplify right side
   3,451.38x = 10,281,258
5. Step 5: Solve for x
   x = 10,281,258/3,451.38
6. Step 6: Final answer
   x = 2,978.88