Finding the Third Proportional to 20,880 and 42,783.75

Step by Step Solution

1. Step 1: Write the proportion equation
   20,880 : 42,783.75 = 42,783.75 : x
2. Step 2: Convert to fraction form
   20,880/42,783.75 = 42,783.75/x
3. Step 3: Cross multiply
   20,880x = 42,783.75 × 42,783.75
4. Step 4: Simplify right side
   20,880x = 1,830,449,264.06
5. Step 5: Solve for x
   x = 1,830,449,264.06/20,880
6. Step 6: Final answer
   x = 87,665.19