Finding the Third Proportional to 139,110.75 and 208,696.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,110.75 : 208,696.50 = 208,696.50 : x
2. Step 2: Convert to fraction form
   139,110.75/208,696.50 = 208,696.50/x
3. Step 3: Cross multiply
   139,110.75x = 208,696.50 × 208,696.50
4. Step 4: Simplify right side
   139,110.75x = 43,554,229,112.25
5. Step 5: Solve for x
   x = 43,554,229,112.25/139,110.75
6. Step 6: Final answer
   x = 313,090.32