Finding the Fourth Proportional to 13,086.86, 18,060.05 and 7,118.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.86 : 18,060.05 = 7,118.78 : x
2. Step 2: Convert to fraction form
   13,086.86/18,060.05 = 7,118.78/x
3. Step 3: Cross multiply
   13,086.86x = 18,060.05 × 7,118.78
4. Step 4: Simplify right side
   13,086.86x = 128,565,487.15
5. Step 5: Solve for x
   x = 128,565,487.15/13,086.86
6. Step 6: Final answer
   x = 9,824.01