Finding the Third Proportional to 139,027.50 and 299,700

Step by Step Solution

1. Step 1: Write the proportion equation
   139,027.50 : 299,700 = 299,700 : x
2. Step 2: Convert to fraction form
   139,027.50/299,700 = 299,700/x
3. Step 3: Cross multiply
   139,027.50x = 299,700 × 299,700
4. Step 4: Simplify right side
   139,027.50x = 89,820,090,000
5. Step 5: Solve for x
   x = 89,820,090,000/139,027.50
6. Step 6: Final answer
   x = 646,059.88