Finding the Fourth Proportional to 21,978.52, 30,327.94 and 12,545.26

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.52 : 30,327.94 = 12,545.26 : x
2. Step 2: Convert to fraction form
   21,978.52/30,327.94 = 12,545.26/x
3. Step 3: Cross multiply
   21,978.52x = 30,327.94 × 12,545.26
4. Step 4: Simplify right side
   21,978.52x = 380,471,892.56
5. Step 5: Solve for x
   x = 380,471,892.56/21,978.52
6. Step 6: Final answer
   x = 17,311.08