Finding the Fourth Proportional to 21,823.89, 32,690.42 and 21,071.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,823.89 : 32,690.42 = 21,071.09 : x
2. Step 2: Convert to fraction form
   21,823.89/32,690.42 = 21,071.09/x
3. Step 3: Cross multiply
   21,823.89x = 32,690.42 × 21,071.09
4. Step 4: Simplify right side
   21,823.89x = 688,822,781.96
5. Step 5: Solve for x
   x = 688,822,781.96/21,823.89
6. Step 6: Final answer
   x = 31,562.79