Finding the Fourth Proportional to 9,898.88, 13,660.32 and 5,422.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.88 : 13,660.32 = 5,422.56 : x
2. Step 2: Convert to fraction form
   9,898.88/13,660.32 = 5,422.56/x
3. Step 3: Cross multiply
   9,898.88x = 13,660.32 × 5,422.56
4. Step 4: Simplify right side
   9,898.88x = 74,073,904.82
5. Step 5: Solve for x
   x = 74,073,904.82/9,898.88
6. Step 6: Final answer
   x = 7,483.06