Finding the Third Proportional to 66,372 and 143,300

Step by Step Solution

1. Step 1: Write the proportion equation
   66,372 : 143,300 = 143,300 : x
2. Step 2: Convert to fraction form
   66,372/143,300 = 143,300/x
3. Step 3: Cross multiply
   66,372x = 143,300 × 143,300
4. Step 4: Simplify right side
   66,372x = 20,534,890,000
5. Step 5: Solve for x
   x = 20,534,890,000/66,372
6. Step 6: Final answer
   x = 309,390.86