Finding the Fourth Proportional to 7,047.92, 9,726.72 and 3,904.40

Step by Step Solution

1. Step 1: Write the proportion equation
   7,047.92 : 9,726.72 = 3,904.40 : x
2. Step 2: Convert to fraction form
   7,047.92/9,726.72 = 3,904.40/x
3. Step 3: Cross multiply
   7,047.92x = 9,726.72 × 3,904.40
4. Step 4: Simplify right side
   7,047.92x = 37,977,005.57
5. Step 5: Solve for x
   x = 37,977,005.57/7,047.92
6. Step 6: Final answer
   x = 5,388.40