Finding the Fourth Proportional to 2,978.76, 4,464.08 and 1,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.76 : 4,464.08 = 1,128.88 : x
2. Step 2: Convert to fraction form
   2,978.76/4,464.08 = 1,128.88/x
3. Step 3: Cross multiply
   2,978.76x = 4,464.08 × 1,128.88
4. Step 4: Simplify right side
   2,978.76x = 5,039,410.63
5. Step 5: Solve for x
   x = 5,039,410.63/2,978.76
6. Step 6: Final answer
   x = 1,691.78