Finding the Third Proportional to 139,168.13 and 209,359.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,168.13 : 209,359.69 = 209,359.69 : x
2. Step 2: Convert to fraction form
   139,168.13/209,359.69 = 209,359.69/x
3. Step 3: Cross multiply
   139,168.13x = 209,359.69 × 209,359.69
4. Step 4: Simplify right side
   139,168.13x = 43,831,478,750.10
5. Step 5: Solve for x
   x = 43,831,478,750.10/139,168.13
6. Step 6: Final answer
   x = 314,953.43