Finding the Fourth Proportional to 13,321.32, 19,990.89 and 5,530.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,321.32 : 19,990.89 = 5,530.12 : x
2. Step 2: Convert to fraction form
   13,321.32/19,990.89 = 5,530.12/x
3. Step 3: Cross multiply
   13,321.32x = 19,990.89 × 5,530.12
4. Step 4: Simplify right side
   13,321.32x = 110,552,020.61
5. Step 5: Solve for x
   x = 110,552,020.61/13,321.32
6. Step 6: Final answer
   x = 8,298.88