Finding the Fourth Proportional to 5,216.30, 7,198.12 and 2,978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,216.30 : 7,198.12 = 2,978.12 : x
2. Step 2: Convert to fraction form
   5,216.30/7,198.12 = 2,978.12/x
3. Step 3: Cross multiply
   5,216.30x = 7,198.12 × 2,978.12
4. Step 4: Simplify right side
   5,216.30x = 21,436,829.61
5. Step 5: Solve for x
   x = 21,436,829.61/5,216.30
6. Step 6: Final answer
   x = 4,109.59