Finding the Fourth Proportional to 21,721.32, 32,575.50 and 7,678.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,721.32 : 32,575.50 = 7,678.76 : x
2. Step 2: Convert to fraction form
   21,721.32/32,575.50 = 7,678.76/x
3. Step 3: Cross multiply
   21,721.32x = 32,575.50 × 7,678.76
4. Step 4: Simplify right side
   21,721.32x = 250,139,446.38
5. Step 5: Solve for x
   x = 250,139,446.38/21,721.32
6. Step 6: Final answer
   x = 11,515.85