Finding the Fourth Proportional to 13,116.42, 18,100.67 and 7,148.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,116.42 : 18,100.67 = 7,148.09 : x
2. Step 2: Convert to fraction form
   13,116.42/18,100.67 = 7,148.09/x
3. Step 3: Cross multiply
   13,116.42x = 18,100.67 × 7,148.09
4. Step 4: Simplify right side
   13,116.42x = 129,385,260.24
5. Step 5: Solve for x
   x = 129,385,260.24/13,116.42
6. Step 6: Final answer
   x = 9,864.37