Finding the Third Proportional to 139,309.88 and 215,242.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,309.88 : 215,242.88 = 215,242.88 : x
2. Step 2: Convert to fraction form
   139,309.88/215,242.88 = 215,242.88/x
3. Step 3: Cross multiply
   139,309.88x = 215,242.88 × 215,242.88
4. Step 4: Simplify right side
   139,309.88x = 46,329,495,238.27
5. Step 5: Solve for x
   x = 46,329,495,238.27/139,309.88
6. Step 6: Final answer
   x = 332,564.33