Finding the Fourth Proportional to 7,978.56, 10,998.98 and 5,613.36

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.56 : 10,998.98 = 5,613.36 : x
2. Step 2: Convert to fraction form
   7,978.56/10,998.98 = 5,613.36/x
3. Step 3: Cross multiply
   7,978.56x = 10,998.98 × 5,613.36
4. Step 4: Simplify right side
   7,978.56x = 61,741,234.37
5. Step 5: Solve for x
   x = 61,741,234.37/7,978.56
6. Step 6: Final answer
   x = 7,738.39