Finding the Fourth Proportional to 7,978.56, 11,014.56 and 5,622.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.56 : 11,014.56 = 5,622.72 : x
2. Step 2: Convert to fraction form
   7,978.56/11,014.56 = 5,622.72/x
3. Step 3: Cross multiply
   7,978.56x = 11,014.56 × 5,622.72
4. Step 4: Simplify right side
   7,978.56x = 61,931,786.80
5. Step 5: Solve for x
   x = 61,931,786.80/7,978.56
6. Step 6: Final answer
   x = 7,762.28