Finding the Fourth Proportional to 10,513.36, 15,772.78 and 3,940.04

Step by Step Solution

1. Step 1: Write the proportion equation
   10,513.36 : 15,772.78 = 3,940.04 : x
2. Step 2: Convert to fraction form
   10,513.36/15,772.78 = 3,940.04/x
3. Step 3: Cross multiply
   10,513.36x = 15,772.78 × 3,940.04
4. Step 4: Simplify right side
   10,513.36x = 62,145,384.11
5. Step 5: Solve for x
   x = 62,145,384.11/10,513.36
6. Step 6: Final answer
   x = 5,911.09