Finding the Fourth Proportional to 7,978.70, 11,017.06 and 5,147.48

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.70 : 11,017.06 = 5,147.48 : x
2. Step 2: Convert to fraction form
   7,978.70/11,017.06 = 5,147.48/x
3. Step 3: Cross multiply
   7,978.70x = 11,017.06 × 5,147.48
4. Step 4: Simplify right side
   7,978.70x = 56,710,028.05
5. Step 5: Solve for x
   x = 56,710,028.05/7,978.70
6. Step 6: Final answer
   x = 7,107.68