Finding the Fourth Proportional to 21,908.31, 32,878.31 and 8,764.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,908.31 : 32,878.31 = 8,764.35 : x
2. Step 2: Convert to fraction form
   21,908.31/32,878.31 = 8,764.35/x
3. Step 3: Cross multiply
   21,908.31x = 32,878.31 × 8,764.35
4. Step 4: Simplify right side
   21,908.31x = 288,157,016.25
5. Step 5: Solve for x
   x = 288,157,016.25/21,908.31
6. Step 6: Final answer
   x = 13,152.86