Finding the Third Proportional to 315,420 and 672,130.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,420 : 672,130.50 = 672,130.50 : x
2. Step 2: Convert to fraction form
   315,420/672,130.50 = 672,130.50/x
3. Step 3: Cross multiply
   315,420x = 672,130.50 × 672,130.50
4. Step 4: Simplify right side
   315,420x = 451,759,409,030.25
5. Step 5: Solve for x
   x = 451,759,409,030.25/315,420
6. Step 6: Final answer
   x = 1,432,247.19