Finding the Fourth Proportional to 9,898.04, 13,659.54 and 5,421.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.04 : 13,659.54 = 5,421.98 : x
2. Step 2: Convert to fraction form
   9,898.04/13,659.54 = 5,421.98/x
3. Step 3: Cross multiply
   9,898.04x = 13,659.54 × 5,421.98
4. Step 4: Simplify right side
   9,898.04x = 74,061,752.69
5. Step 5: Solve for x
   x = 74,061,752.69/9,898.04
6. Step 6: Final answer
   x = 7,482.47