Finding the Fourth Proportional to 2,978.57, 4,461.78 and 2,878.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.57 : 4,461.78 = 2,878.79 : x
2. Step 2: Convert to fraction form
   2,978.57/4,461.78 = 2,878.79/x
3. Step 3: Cross multiply
   2,978.57x = 4,461.78 × 2,878.79
4. Step 4: Simplify right side
   2,978.57x = 12,844,541.23
5. Step 5: Solve for x
   x = 12,844,541.23/2,978.57
6. Step 6: Final answer
   x = 4,312.31