Finding the Fourth Proportional to 9,898.05, 13,659.34 and 5,421.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.05 : 13,659.34 = 5,421.71 : x
2. Step 2: Convert to fraction form
   9,898.05/13,659.34 = 5,421.71/x
3. Step 3: Cross multiply
   9,898.05x = 13,659.34 × 5,421.71
4. Step 4: Simplify right side
   9,898.05x = 74,056,980.27
5. Step 5: Solve for x
   x = 74,056,980.27/9,898.05
6. Step 6: Final answer
   x = 7,481.98