Finding the Fourth Proportional to 15,559.34, 21,471.63 and 8,485.34

Step by Step Solution

1. Step 1: Write the proportion equation
   15,559.34 : 21,471.63 = 8,485.34 : x
2. Step 2: Convert to fraction form
   15,559.34/21,471.63 = 8,485.34/x
3. Step 3: Cross multiply
   15,559.34x = 21,471.63 × 8,485.34
4. Step 4: Simplify right side
   15,559.34x = 182,194,080.90
5. Step 5: Solve for x
   x = 182,194,080.90/15,559.34
6. Step 6: Final answer
   x = 11,709.63