Finding the Third Proportional to 143,924 and 314,992

Step by Step Solution

1. Step 1: Write the proportion equation
   143,924 : 314,992 = 314,992 : x
2. Step 2: Convert to fraction form
   143,924/314,992 = 314,992/x
3. Step 3: Cross multiply
   143,924x = 314,992 × 314,992
4. Step 4: Simplify right side
   143,924x = 99,219,960,064
5. Step 5: Solve for x
   x = 99,219,960,064/143,924
6. Step 6: Final answer
   x = 689,391.35