Finding the Fourth Proportional to 68,085.72, 102,131.82 and 21,339

Step by Step Solution

1. Step 1: Write the proportion equation
   68,085.72 : 102,131.82 = 21,339 : x
2. Step 2: Convert to fraction form
   68,085.72/102,131.82 = 21,339/x
3. Step 3: Cross multiply
   68,085.72x = 102,131.82 × 21,339
4. Step 4: Simplify right side
   68,085.72x = 2,179,390,906.98
5. Step 5: Solve for x
   x = 2,179,390,906.98/68,085.72
6. Step 6: Final answer
   x = 32,009.52