Finding the Fourth Proportional to 3,451.39, 5,172.95 and 1,987.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,451.39 : 5,172.95 = 1,987.52 : x
2. Step 2: Convert to fraction form
   3,451.39/5,172.95 = 1,987.52/x
3. Step 3: Cross multiply
   3,451.39x = 5,172.95 × 1,987.52
4. Step 4: Simplify right side
   3,451.39x = 10,281,320.69
5. Step 5: Solve for x
   x = 10,281,320.69/3,451.39
6. Step 6: Final answer
   x = 2,978.89