Finding the Fourth Proportional to 9,898.61, 13,659.89 and 5,422.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.61 : 13,659.89 = 5,422.34 : x
2. Step 2: Convert to fraction form
   9,898.61/13,659.89 = 5,422.34/x
3. Step 3: Cross multiply
   9,898.61x = 13,659.89 × 5,422.34
4. Step 4: Simplify right side
   9,898.61x = 74,068,574.98
5. Step 5: Solve for x
   x = 74,068,574.98/9,898.61
6. Step 6: Final answer
   x = 7,482.73