Finding the Fourth Proportional to 2,315.25, 3,187.62 and 1,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,315.25 : 3,187.62 = 1,978.56 : x
2. Step 2: Convert to fraction form
   2,315.25/3,187.62 = 1,978.56/x
3. Step 3: Cross multiply
   2,315.25x = 3,187.62 × 1,978.56
4. Step 4: Simplify right side
   2,315.25x = 6,306,897.43
5. Step 5: Solve for x
   x = 6,306,897.43/2,315.25
6. Step 6: Final answer
   x = 2,724.07