Finding the Fourth Proportional to 21,162.52, 31,557.47 and 19,685.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.52 : 31,557.47 = 19,685.08 : x
2. Step 2: Convert to fraction form
   21,162.52/31,557.47 = 19,685.08/x
3. Step 3: Cross multiply
   21,162.52x = 31,557.47 × 19,685.08
4. Step 4: Simplify right side
   21,162.52x = 621,211,321.55
5. Step 5: Solve for x
   x = 621,211,321.55/21,162.52
6. Step 6: Final answer
   x = 29,354.32