Finding the Fourth Proportional to 8,687.86, 11,978.49 and 5,888.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,687.86 : 11,978.49 = 5,888.50 : x
2. Step 2: Convert to fraction form
   8,687.86/11,978.49 = 5,888.50/x
3. Step 3: Cross multiply
   8,687.86x = 11,978.49 × 5,888.50
4. Step 4: Simplify right side
   8,687.86x = 70,535,338.37
5. Step 5: Solve for x
   x = 70,535,338.37/8,687.86
6. Step 6: Final answer
   x = 8,118.84