Finding the Fourth Proportional to 21,835.98, 32,722.65 and 12,456.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,835.98 : 32,722.65 = 12,456.57 : x
2. Step 2: Convert to fraction form
   21,835.98/32,722.65 = 12,456.57/x
3. Step 3: Cross multiply
   21,835.98x = 32,722.65 × 12,456.57
4. Step 4: Simplify right side
   21,835.98x = 407,611,980.31
5. Step 5: Solve for x
   x = 407,611,980.31/21,835.98
6. Step 6: Final answer
   x = 18,666.99