Finding the Third Proportional to 221,415 and 485,385.75

Step by Step Solution

1. Step 1: Write the proportion equation
   221,415 : 485,385.75 = 485,385.75 : x
2. Step 2: Convert to fraction form
   221,415/485,385.75 = 485,385.75/x
3. Step 3: Cross multiply
   221,415x = 485,385.75 × 485,385.75
4. Step 4: Simplify right side
   221,415x = 235,599,326,303.06
5. Step 5: Solve for x
   x = 235,599,326,303.06/221,415
6. Step 6: Final answer
   x = 1,064,062.17