Finding the Third Proportional to 62,605.50 and 139,209

Step by Step Solution

1. Step 1: Write the proportion equation
   62,605.50 : 139,209 = 139,209 : x
2. Step 2: Convert to fraction form
   62,605.50/139,209 = 139,209/x
3. Step 3: Cross multiply
   62,605.50x = 139,209 × 139,209
4. Step 4: Simplify right side
   62,605.50x = 19,379,145,681
5. Step 5: Solve for x
   x = 19,379,145,681/62,605.50
6. Step 6: Final answer
   x = 309,543.82