Finding the Fourth Proportional to 12,451.02, 18,671.27 and 4,128.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,451.02 : 18,671.27 = 4,128.81 : x
2. Step 2: Convert to fraction form
   12,451.02/18,671.27 = 4,128.81/x
3. Step 3: Cross multiply
   12,451.02x = 18,671.27 × 4,128.81
4. Step 4: Simplify right side
   12,451.02x = 77,090,105.64
5. Step 5: Solve for x
   x = 77,090,105.64/12,451.02
6. Step 6: Final answer
   x = 6,191.47