Finding the Fourth Proportional to 9,998.56, 13,798.12 and 5,522.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,998.56 : 13,798.12 = 5,522.21 : x
2. Step 2: Convert to fraction form
   9,998.56/13,798.12 = 5,522.21/x
3. Step 3: Cross multiply
   9,998.56x = 13,798.12 × 5,522.21
4. Step 4: Simplify right side
   9,998.56x = 76,196,047.25
5. Step 5: Solve for x
   x = 76,196,047.25/9,998.56
6. Step 6: Final answer
   x = 7,620.71