Finding the Fourth Proportional to 9,898.19, 13,659.50 and 5,421.93

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.19 : 13,659.50 = 5,421.93 : x
2. Step 2: Convert to fraction form
   9,898.19/13,659.50 = 5,421.93/x
3. Step 3: Cross multiply
   9,898.19x = 13,659.50 × 5,421.93
4. Step 4: Simplify right side
   9,898.19x = 74,060,825.73
5. Step 5: Solve for x
   x = 74,060,825.73/9,898.19
6. Step 6: Final answer
   x = 7,482.26