Finding the Fourth Proportional to 9,898.56, 13,659.84 and 5,422.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.56 : 13,659.84 = 5,422.40 : x
2. Step 2: Convert to fraction form
   9,898.56/13,659.84 = 5,422.40/x
3. Step 3: Cross multiply
   9,898.56x = 13,659.84 × 5,422.40
4. Step 4: Simplify right side
   9,898.56x = 74,069,116.42
5. Step 5: Solve for x
   x = 74,069,116.42/9,898.56
6. Step 6: Final answer
   x = 7,482.82