Finding the Fourth Proportional to 2,978.60, 4,454.78 and 2,651.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.60 : 4,454.78 = 2,651.69 : x
2. Step 2: Convert to fraction form
   2,978.60/4,454.78 = 2,651.69/x
3. Step 3: Cross multiply
   2,978.60x = 4,454.78 × 2,651.69
4. Step 4: Simplify right side
   2,978.60x = 11,812,693.46
5. Step 5: Solve for x
   x = 11,812,693.46/2,978.60
6. Step 6: Final answer
   x = 3,965.86