Finding the Fourth Proportional to 8,835.60, 12,186.78 and 5,688.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,835.60 : 12,186.78 = 5,688.78 : x
2. Step 2: Convert to fraction form
   8,835.60/12,186.78 = 5,688.78/x
3. Step 3: Cross multiply
   8,835.60x = 12,186.78 × 5,688.78
4. Step 4: Simplify right side
   8,835.60x = 69,327,910.33
5. Step 5: Solve for x
   x = 69,327,910.33/8,835.60
6. Step 6: Final answer
   x = 7,846.43