Finding the Third Proportional to 63,213 and 139,155

Step by Step Solution

1. Step 1: Write the proportion equation
   63,213 : 139,155 = 139,155 : x
2. Step 2: Convert to fraction form
   63,213/139,155 = 139,155/x
3. Step 3: Cross multiply
   63,213x = 139,155 × 139,155
4. Step 4: Simplify right side
   63,213x = 19,364,114,025
5. Step 5: Solve for x
   x = 19,364,114,025/63,213
6. Step 6: Final answer
   x = 306,331.20