Finding the Fourth Proportional to 9,789.12, 14,677.20 and 3,938.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,789.12 : 14,677.20 = 3,938.40 : x
2. Step 2: Convert to fraction form
   9,789.12/14,677.20 = 3,938.40/x
3. Step 3: Cross multiply
   9,789.12x = 14,677.20 × 3,938.40
4. Step 4: Simplify right side
   9,789.12x = 57,804,684.48
5. Step 5: Solve for x
   x = 57,804,684.48/9,789.12
6. Step 6: Final answer
   x = 5,904.99