Finding the Fourth Proportional to 15,868.42, 21,898.69 and 8,697.86

Step by Step Solution

1. Step 1: Write the proportion equation
   15,868.42 : 21,898.69 = 8,697.86 : x
2. Step 2: Convert to fraction form
   15,868.42/21,898.69 = 8,697.86/x
3. Step 3: Cross multiply
   15,868.42x = 21,898.69 × 8,697.86
4. Step 4: Simplify right side
   15,868.42x = 190,471,665.79
5. Step 5: Solve for x
   x = 190,471,665.79/15,868.42
6. Step 6: Final answer
   x = 12,003.19