Finding the Fourth Proportional to 3,906.06, 5,389.62 and 2,648.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.06 : 5,389.62 = 2,648.12 : x
2. Step 2: Convert to fraction form
   3,906.06/5,389.62 = 2,648.12/x
3. Step 3: Cross multiply
   3,906.06x = 5,389.62 × 2,648.12
4. Step 4: Simplify right side
   3,906.06x = 14,272,360.51
5. Step 5: Solve for x
   x = 14,272,360.51/3,906.06
6. Step 6: Final answer
   x = 3,653.90