Finding the Fourth Proportional to 2,978.16, 4,466.68 and 1,129.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.16 : 4,466.68 = 1,129.20 : x
2. Step 2: Convert to fraction form
   2,978.16/4,466.68 = 1,129.20/x
3. Step 3: Cross multiply
   2,978.16x = 4,466.68 × 1,129.20
4. Step 4: Simplify right side
   2,978.16x = 5,043,775.06
5. Step 5: Solve for x
   x = 5,043,775.06/2,978.16
6. Step 6: Final answer
   x = 1,693.59