Finding the Fourth Proportional to 13,078.26, 18,047.61 and 7,109.77

Step by Step Solution

1. Step 1: Write the proportion equation
   13,078.26 : 18,047.61 = 7,109.77 : x
2. Step 2: Convert to fraction form
   13,078.26/18,047.61 = 7,109.77/x
3. Step 3: Cross multiply
   13,078.26x = 18,047.61 × 7,109.77
4. Step 4: Simplify right side
   13,078.26x = 128,314,356.15
5. Step 5: Solve for x
   x = 128,314,356.15/13,078.26
6. Step 6: Final answer
   x = 9,811.27