Finding the Fourth Proportional to 15,868.86, 21,899.59 and 8,698.77

Step by Step Solution

1. Step 1: Write the proportion equation
   15,868.86 : 21,899.59 = 8,698.77 : x
2. Step 2: Convert to fraction form
   15,868.86/21,899.59 = 8,698.77/x
3. Step 3: Cross multiply
   15,868.86x = 21,899.59 × 8,698.77
4. Step 4: Simplify right side
   15,868.86x = 190,499,589.98
5. Step 5: Solve for x
   x = 190,499,589.98/15,868.86
6. Step 6: Final answer
   x = 12,004.61