Finding the Third Proportional to 395,415 and 612,785.25

Step by Step Solution

1. Step 1: Write the proportion equation
   395,415 : 612,785.25 = 612,785.25 : x
2. Step 2: Convert to fraction form
   395,415/612,785.25 = 612,785.25/x
3. Step 3: Cross multiply
   395,415x = 612,785.25 × 612,785.25
4. Step 4: Simplify right side
   395,415x = 375,505,762,617.56
5. Step 5: Solve for x
   x = 375,505,762,617.56/395,415
6. Step 6: Final answer
   x = 949,649.77