Finding the Fourth Proportional to 21,386.84, 32,085.72 and 8,902.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,386.84 : 32,085.72 = 8,902.71 : x
2. Step 2: Convert to fraction form
   21,386.84/32,085.72 = 8,902.71/x
3. Step 3: Cross multiply
   21,386.84x = 32,085.72 × 8,902.71
4. Step 4: Simplify right side
   21,386.84x = 285,649,860.30
5. Step 5: Solve for x
   x = 285,649,860.30/21,386.84
6. Step 6: Final answer
   x = 13,356.34