Finding the Fourth Proportional to 8,128.51, 12,195.47 and 5,495.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.51 : 12,195.47 = 5,495.90 : x
2. Step 2: Convert to fraction form
   8,128.51/12,195.47 = 5,495.90/x
3. Step 3: Cross multiply
   8,128.51x = 12,195.47 × 5,495.90
4. Step 4: Simplify right side
   8,128.51x = 67,025,036.34
5. Step 5: Solve for x
   x = 67,025,036.34/8,128.51
6. Step 6: Final answer
   x = 8,245.68