Finding the Third Proportional to 139,715.72 and 311,048.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,715.72 : 311,048.72 = 311,048.72 : x
2. Step 2: Convert to fraction form
   139,715.72/311,048.72 = 311,048.72/x
3. Step 3: Cross multiply
   139,715.72x = 311,048.72 × 311,048.72
4. Step 4: Simplify right side
   139,715.72x = 96,751,305,436.02
5. Step 5: Solve for x
   x = 96,751,305,436.02/139,715.72
6. Step 6: Final answer
   x = 692,486.90