Finding the Fourth Proportional to 10,478.57, 15,707.95 and 3,900.29

Step by Step Solution

1. Step 1: Write the proportion equation
   10,478.57 : 15,707.95 = 3,900.29 : x
2. Step 2: Convert to fraction form
   10,478.57/15,707.95 = 3,900.29/x
3. Step 3: Cross multiply
   10,478.57x = 15,707.95 × 3,900.29
4. Step 4: Simplify right side
   10,478.57x = 61,265,560.31
5. Step 5: Solve for x
   x = 61,265,560.31/10,478.57
6. Step 6: Final answer
   x = 5,846.75