Finding the Fourth Proportional to 22,413.56, 30,941.34 and 12,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   22,413.56 : 30,941.34 = 12,978.68 : x
2. Step 2: Convert to fraction form
   22,413.56/30,941.34 = 12,978.68/x
3. Step 3: Cross multiply
   22,413.56x = 30,941.34 × 12,978.68
4. Step 4: Simplify right side
   22,413.56x = 401,577,750.63
5. Step 5: Solve for x
   x = 401,577,750.63/22,413.56
6. Step 6: Final answer
   x = 17,916.73