Finding the Third Proportional to 62,611.50 and 139,219.50

Step by Step Solution

1. Step 1: Write the proportion equation
   62,611.50 : 139,219.50 = 139,219.50 : x
2. Step 2: Convert to fraction form
   62,611.50/139,219.50 = 139,219.50/x
3. Step 3: Cross multiply
   62,611.50x = 139,219.50 × 139,219.50
4. Step 4: Simplify right side
   62,611.50x = 19,382,069,180.25
5. Step 5: Solve for x
   x = 19,382,069,180.25/62,611.50
6. Step 6: Final answer
   x = 309,560.85