Finding the Fourth Proportional to 7,122.37, 9,828.89 and 3,978.67

Step by Step Solution

1. Step 1: Write the proportion equation
   7,122.37 : 9,828.89 = 3,978.67 : x
2. Step 2: Convert to fraction form
   7,122.37/9,828.89 = 3,978.67/x
3. Step 3: Cross multiply
   7,122.37x = 9,828.89 × 3,978.67
4. Step 4: Simplify right side
   7,122.37x = 39,105,909.78
5. Step 5: Solve for x
   x = 39,105,909.78/7,122.37
6. Step 6: Final answer
   x = 5,490.58