Finding the Fourth Proportional to 12,402.90, 18,606.72 and 4,085.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,402.90 : 18,606.72 = 4,085.33 : x
2. Step 2: Convert to fraction form
   12,402.90/18,606.72 = 4,085.33/x
3. Step 3: Cross multiply
   12,402.90x = 18,606.72 × 4,085.33
4. Step 4: Simplify right side
   12,402.90x = 76,014,498.38
5. Step 5: Solve for x
   x = 76,014,498.38/12,402.90
6. Step 6: Final answer
   x = 6,128.77