Finding the Fourth Proportional to 21,864.59, 32,788.82 and 7,820.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,864.59 : 32,788.82 = 7,820.81 : x
2. Step 2: Convert to fraction form
   21,864.59/32,788.82 = 7,820.81/x
3. Step 3: Cross multiply
   21,864.59x = 32,788.82 × 7,820.81
4. Step 4: Simplify right side
   21,864.59x = 256,434,928.30
5. Step 5: Solve for x
   x = 256,434,928.30/21,864.59
6. Step 6: Final answer
   x = 11,728.32