Finding the Third Proportional to 99,969.75 and 216,886.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,969.75 : 216,886.50 = 216,886.50 : x
2. Step 2: Convert to fraction form
   99,969.75/216,886.50 = 216,886.50/x
3. Step 3: Cross multiply
   99,969.75x = 216,886.50 × 216,886.50
4. Step 4: Simplify right side
   99,969.75x = 47,039,753,882.25
5. Step 5: Solve for x
   x = 47,039,753,882.25/99,969.75
6. Step 6: Final answer
   x = 470,539.88