Finding the Fourth Proportional to 13,078.18, 18,048.04 and 7,109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,078.18 : 18,048.04 = 7,109.72 : x
2. Step 2: Convert to fraction form
   13,078.18/18,048.04 = 7,109.72/x
3. Step 3: Cross multiply
   13,078.18x = 18,048.04 × 7,109.72
4. Step 4: Simplify right side
   13,078.18x = 128,316,402.93
5. Step 5: Solve for x
   x = 128,316,402.93/13,078.18
6. Step 6: Final answer
   x = 9,811.49