Finding the Fourth Proportional to 13,078.71, 18,047.25 and 7,772.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,078.71 : 18,047.25 = 7,772.49 : x
2. Step 2: Convert to fraction form
   13,078.71/18,047.25 = 7,772.49/x
3. Step 3: Cross multiply
   13,078.71x = 18,047.25 × 7,772.49
4. Step 4: Simplify right side
   13,078.71x = 140,272,070.15
5. Step 5: Solve for x
   x = 140,272,070.15/13,078.71
6. Step 6: Final answer
   x = 10,725.22