Finding the Third Proportional to 142,516 and 302,521.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,516 : 302,521.50 = 302,521.50 : x
2. Step 2: Convert to fraction form
   142,516/302,521.50 = 302,521.50/x
3. Step 3: Cross multiply
   142,516x = 302,521.50 × 302,521.50
4. Step 4: Simplify right side
   142,516x = 91,519,257,962.25
5. Step 5: Solve for x
   x = 91,519,257,962.25/142,516
6. Step 6: Final answer
   x = 642,168.30