Finding the Fourth Proportional to 15,815.59, 21,825.52 and 8,742.01

Step by Step Solution

1. Step 1: Write the proportion equation
   15,815.59 : 21,825.52 = 8,742.01 : x
2. Step 2: Convert to fraction form
   15,815.59/21,825.52 = 8,742.01/x
3. Step 3: Cross multiply
   15,815.59x = 21,825.52 × 8,742.01
4. Step 4: Simplify right side
   15,815.59x = 190,798,914.10
5. Step 5: Solve for x
   x = 190,798,914.10/15,815.59
6. Step 6: Final answer
   x = 12,063.98