Finding the Fourth Proportional to 21,459.78, 32,178.69 and 8,976.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,459.78 : 32,178.69 = 8,976.39 : x
2. Step 2: Convert to fraction form
   21,459.78/32,178.69 = 8,976.39/x
3. Step 3: Cross multiply
   21,459.78x = 32,178.69 × 8,976.39
4. Step 4: Simplify right side
   21,459.78x = 288,848,471.13
5. Step 5: Solve for x
   x = 288,848,471.13/21,459.78
6. Step 6: Final answer
   x = 13,459.99