Finding the Third Proportional to 66,321 and 143,196.75

Step by Step Solution

1. Step 1: Write the proportion equation
   66,321 : 143,196.75 = 143,196.75 : x
2. Step 2: Convert to fraction form
   66,321/143,196.75 = 143,196.75/x
3. Step 3: Cross multiply
   66,321x = 143,196.75 × 143,196.75
4. Step 4: Simplify right side
   66,321x = 20,505,309,210.56
5. Step 5: Solve for x
   x = 20,505,309,210.56/66,321
6. Step 6: Final answer
   x = 309,182.75