Finding the Fourth Proportional to 13,077.40, 18,046.42 and 7,108.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,077.40 : 18,046.42 = 7,108.91 : x
2. Step 2: Convert to fraction form
   13,077.40/18,046.42 = 7,108.91/x
3. Step 3: Cross multiply
   13,077.40x = 18,046.42 × 7,108.91
4. Step 4: Simplify right side
   13,077.40x = 128,290,456.78
5. Step 5: Solve for x
   x = 128,290,456.78/13,077.40
6. Step 6: Final answer
   x = 9,810.09