Finding the Fourth Proportional to 13,106.78, 18,086.94 and 7,656.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,106.78 : 18,086.94 = 7,656.86 : x
2. Step 2: Convert to fraction form
   13,106.78/18,086.94 = 7,656.86/x
3. Step 3: Cross multiply
   13,106.78x = 18,086.94 × 7,656.86
4. Step 4: Simplify right side
   13,106.78x = 138,489,167.41
5. Step 5: Solve for x
   x = 138,489,167.41/13,106.78
6. Step 6: Final answer
   x = 10,566.22