Finding the Fourth Proportional to 9,898.23, 13,659.57 and 5,421.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.23 : 13,659.57 = 5,421.99 : x
2. Step 2: Convert to fraction form
   9,898.23/13,659.57 = 5,421.99/x
3. Step 3: Cross multiply
   9,898.23x = 13,659.57 × 5,421.99
4. Step 4: Simplify right side
   9,898.23x = 74,062,051.94
5. Step 5: Solve for x
   x = 74,062,051.94/9,898.23
6. Step 6: Final answer
   x = 7,482.35