Finding the Fourth Proportional to 15,869.69, 21,900.42 and 8,699.52

Step by Step Solution

1. Step 1: Write the proportion equation
   15,869.69 : 21,900.42 = 8,699.52 : x
2. Step 2: Convert to fraction form
   15,869.69/21,900.42 = 8,699.52/x
3. Step 3: Cross multiply
   15,869.69x = 21,900.42 × 8,699.52
4. Step 4: Simplify right side
   15,869.69x = 190,523,141.80
5. Step 5: Solve for x
   x = 190,523,141.80/15,869.69
6. Step 6: Final answer
   x = 12,005.48