Finding the Third Proportional to 139,025.50 and 215,450.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,025.50 : 215,450.50 = 215,450.50 : x
2. Step 2: Convert to fraction form
   139,025.50/215,450.50 = 215,450.50/x
3. Step 3: Cross multiply
   139,025.50x = 215,450.50 × 215,450.50
4. Step 4: Simplify right side
   139,025.50x = 46,418,917,950.25
5. Step 5: Solve for x
   x = 46,418,917,950.25/139,025.50
6. Step 6: Final answer
   x = 333,887.80