Finding the Fourth Proportional to 8,620.93, 12,928.89 and 3,938.46

Step by Step Solution

1. Step 1: Write the proportion equation
   8,620.93 : 12,928.89 = 3,938.46 : x
2. Step 2: Convert to fraction form
   8,620.93/12,928.89 = 3,938.46/x
3. Step 3: Cross multiply
   8,620.93x = 12,928.89 × 3,938.46
4. Step 4: Simplify right side
   8,620.93x = 50,919,851.46
5. Step 5: Solve for x
   x = 50,919,851.46/8,620.93
6. Step 6: Final answer
   x = 5,906.54