Finding the Third Proportional to 142,603.88 and 309,838.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,603.88 : 309,838.50 = 309,838.50 : x
2. Step 2: Convert to fraction form
   142,603.88/309,838.50 = 309,838.50/x
3. Step 3: Cross multiply
   142,603.88x = 309,838.50 × 309,838.50
4. Step 4: Simplify right side
   142,603.88x = 95,999,896,082.25
5. Step 5: Solve for x
   x = 95,999,896,082.25/142,603.88
6. Step 6: Final answer
   x = 673,192.76