Finding the Third Proportional to 142,903.50 and 305,490

Step by Step Solution

1. Step 1: Write the proportion equation
   142,903.50 : 305,490 = 305,490 : x
2. Step 2: Convert to fraction form
   142,903.50/305,490 = 305,490/x
3. Step 3: Cross multiply
   142,903.50x = 305,490 × 305,490
4. Step 4: Simplify right side
   142,903.50x = 93,324,140,100
5. Step 5: Solve for x
   x = 93,324,140,100/142,903.50
6. Step 6: Final answer
   x = 653,057.06