Finding the Third Proportional to 19,680 and 42,816

Step by Step Solution

1. Step 1: Write the proportion equation
   19,680 : 42,816 = 42,816 : x
2. Step 2: Convert to fraction form
   19,680/42,816 = 42,816/x
3. Step 3: Cross multiply
   19,680x = 42,816 × 42,816
4. Step 4: Simplify right side
   19,680x = 1,833,209,856
5. Step 5: Solve for x
   x = 1,833,209,856/19,680
6. Step 6: Final answer
   x = 93,150.91