Finding the Third Proportional to 139,810.50 and 299,214

Step by Step Solution

1. Step 1: Write the proportion equation
   139,810.50 : 299,214 = 299,214 : x
2. Step 2: Convert to fraction form
   139,810.50/299,214 = 299,214/x
3. Step 3: Cross multiply
   139,810.50x = 299,214 × 299,214
4. Step 4: Simplify right side
   139,810.50x = 89,529,017,796
5. Step 5: Solve for x
   x = 89,529,017,796/139,810.50
6. Step 6: Final answer
   x = 640,359.76