Finding the Fourth Proportional to 2,978.08, 4,466.48 and 786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.08 : 4,466.48 = 786.72 : x
2. Step 2: Convert to fraction form
   2,978.08/4,466.48 = 786.72/x
3. Step 3: Cross multiply
   2,978.08x = 4,466.48 × 786.72
4. Step 4: Simplify right side
   2,978.08x = 3,513,869.15
5. Step 5: Solve for x
   x = 3,513,869.15/2,978.08
6. Step 6: Final answer
   x = 1,179.91