Finding the Fourth Proportional to 13,078.31, 18,048.17 and 7,109.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,078.31 : 18,048.17 = 7,109.98 : x
2. Step 2: Convert to fraction form
   13,078.31/18,048.17 = 7,109.98/x
3. Step 3: Cross multiply
   13,078.31x = 18,048.17 × 7,109.98
4. Step 4: Simplify right side
   13,078.31x = 128,322,127.74
5. Step 5: Solve for x
   x = 128,322,127.74/13,078.31
6. Step 6: Final answer
   x = 9,811.83