Finding the Third Proportional to 62,590 and 139,173.50

Step by Step Solution

1. Step 1: Write the proportion equation
   62,590 : 139,173.50 = 139,173.50 : x
2. Step 2: Convert to fraction form
   62,590/139,173.50 = 139,173.50/x
3. Step 3: Cross multiply
   62,590x = 139,173.50 × 139,173.50
4. Step 4: Simplify right side
   62,590x = 19,369,263,102.25
5. Step 5: Solve for x
   x = 19,369,263,102.25/62,590
6. Step 6: Final answer
   x = 309,462.58