Finding the Third Proportional to 139,288.50 and 208,935

Step by Step Solution

1. Step 1: Write the proportion equation
   139,288.50 : 208,935 = 208,935 : x
2. Step 2: Convert to fraction form
   139,288.50/208,935 = 208,935/x
3. Step 3: Cross multiply
   139,288.50x = 208,935 × 208,935
4. Step 4: Simplify right side
   139,288.50x = 43,653,834,225
5. Step 5: Solve for x
   x = 43,653,834,225/139,288.50
6. Step 6: Final answer
   x = 313,405.88