Finding the Fourth Proportional to 8,858.10, 12,221.55 and 5,320.02

Step by Step Solution

1. Step 1: Write the proportion equation
   8,858.10 : 12,221.55 = 5,320.02 : x
2. Step 2: Convert to fraction form
   8,858.10/12,221.55 = 5,320.02/x
3. Step 3: Cross multiply
   8,858.10x = 12,221.55 × 5,320.02
4. Step 4: Simplify right side
   8,858.10x = 65,018,890.43
5. Step 5: Solve for x
   x = 65,018,890.43/8,858.10
6. Step 6: Final answer
   x = 7,340.05