Finding the Fourth Proportional to 80,578.89, 120,857.18 and 21,419.37

Step by Step Solution

1. Step 1: Write the proportion equation
   80,578.89 : 120,857.18 = 21,419.37 : x
2. Step 2: Convert to fraction form
   80,578.89/120,857.18 = 21,419.37/x
3. Step 3: Cross multiply
   80,578.89x = 120,857.18 × 21,419.37
4. Step 4: Simplify right side
   80,578.89x = 2,588,684,548.48
5. Step 5: Solve for x
   x = 2,588,684,548.48/80,578.89
6. Step 6: Final answer
   x = 32,126.09