Finding the Fourth Proportional to 43,189.92, 64,787.52 and 13,608.72

Step by Step Solution

1. Step 1: Write the proportion equation
   43,189.92 : 64,787.52 = 13,608.72 : x
2. Step 2: Convert to fraction form
   43,189.92/64,787.52 = 13,608.72/x
3. Step 3: Cross multiply
   43,189.92x = 64,787.52 × 13,608.72
4. Step 4: Simplify right side
   43,189.92x = 881,675,219.17
5. Step 5: Solve for x
   x = 881,675,219.17/43,189.92
6. Step 6: Final answer
   x = 20,413.91