Finding the Third Proportional to 221,490 and 485,887.50

Step by Step Solution

1. Step 1: Write the proportion equation
   221,490 : 485,887.50 = 485,887.50 : x
2. Step 2: Convert to fraction form
   221,490/485,887.50 = 485,887.50/x
3. Step 3: Cross multiply
   221,490x = 485,887.50 × 485,887.50
4. Step 4: Simplify right side
   221,490x = 236,086,662,656.25
5. Step 5: Solve for x
   x = 236,086,662,656.25/221,490
6. Step 6: Final answer
   x = 1,065,902.13