Finding the Fourth Proportional to 9,898.35, 13,659.69 and 5,422.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.35 : 13,659.69 = 5,422.20 : x
2. Step 2: Convert to fraction form
   9,898.35/13,659.69 = 5,422.20/x
3. Step 3: Cross multiply
   9,898.35x = 13,659.69 × 5,422.20
4. Step 4: Simplify right side
   9,898.35x = 74,065,571.12
5. Step 5: Solve for x
   x = 74,065,571.12/9,898.35
6. Step 6: Final answer
   x = 7,482.62