Finding the Third Proportional to 292,429.50 and 428,505

Step by Step Solution

1. Step 1: Write the proportion equation
   292,429.50 : 428,505 = 428,505 : x
2. Step 2: Convert to fraction form
   292,429.50/428,505 = 428,505/x
3. Step 3: Cross multiply
   292,429.50x = 428,505 × 428,505
4. Step 4: Simplify right side
   292,429.50x = 183,616,535,025
5. Step 5: Solve for x
   x = 183,616,535,025/292,429.50
6. Step 6: Final answer
   x = 627,900.18