Finding the Fourth Proportional to 2,978.32, 4,462.87 and 1,128.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.32 : 4,462.87 = 1,128.43 : x
2. Step 2: Convert to fraction form
   2,978.32/4,462.87 = 1,128.43/x
3. Step 3: Cross multiply
   2,978.32x = 4,462.87 × 1,128.43
4. Step 4: Simplify right side
   2,978.32x = 5,036,044.44
5. Step 5: Solve for x
   x = 5,036,044.44/2,978.32
6. Step 6: Final answer
   x = 1,690.90