Finding the Fourth Proportional to 13,086.96, 18,060.20 and 7,118.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.96 : 18,060.20 = 7,118.74 : x
2. Step 2: Convert to fraction form
   13,086.96/18,060.20 = 7,118.74/x
3. Step 3: Cross multiply
   13,086.96x = 18,060.20 × 7,118.74
4. Step 4: Simplify right side
   13,086.96x = 128,565,868.15
5. Step 5: Solve for x
   x = 128,565,868.15/13,086.96
6. Step 6: Final answer
   x = 9,823.97