Finding the Third Proportional to 65,630 and 143,290

Step by Step Solution

1. Step 1: Write the proportion equation
   65,630 : 143,290 = 143,290 : x
2. Step 2: Convert to fraction form
   65,630/143,290 = 143,290/x
3. Step 3: Cross multiply
   65,630x = 143,290 × 143,290
4. Step 4: Simplify right side
   65,630x = 20,532,024,100
5. Step 5: Solve for x
   x = 20,532,024,100/65,630
6. Step 6: Final answer
   x = 312,845.10