Finding the Third Proportional to 142,974 and 309,484.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,974 : 309,484.50 = 309,484.50 : x
2. Step 2: Convert to fraction form
   142,974/309,484.50 = 309,484.50/x
3. Step 3: Cross multiply
   142,974x = 309,484.50 × 309,484.50
4. Step 4: Simplify right side
   142,974x = 95,780,655,740.25
5. Step 5: Solve for x
   x = 95,780,655,740.25/142,974
6. Step 6: Final answer
   x = 669,916.60