Finding the Third Proportional to 63,438 and 139,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   63,438 : 139,428.50 = 139,428.50 : x
2. Step 2: Convert to fraction form
   63,438/139,428.50 = 139,428.50/x
3. Step 3: Cross multiply
   63,438x = 139,428.50 × 139,428.50
4. Step 4: Simplify right side
   63,438x = 19,440,306,612.25
5. Step 5: Solve for x
   x = 19,440,306,612.25/63,438
6. Step 6: Final answer
   x = 306,445.77