Finding the Third Proportional to 143,262 and 312,012

Step by Step Solution

1. Step 1: Write the proportion equation
   143,262 : 312,012 = 312,012 : x
2. Step 2: Convert to fraction form
   143,262/312,012 = 312,012/x
3. Step 3: Cross multiply
   143,262x = 312,012 × 312,012
4. Step 4: Simplify right side
   143,262x = 97,351,488,144
5. Step 5: Solve for x
   x = 97,351,488,144/143,262
6. Step 6: Final answer
   x = 679,534.62