Finding the Third Proportional to 291,222 and 638,536.50

Step by Step Solution

1. Step 1: Write the proportion equation
   291,222 : 638,536.50 = 638,536.50 : x
2. Step 2: Convert to fraction form
   291,222/638,536.50 = 638,536.50/x
3. Step 3: Cross multiply
   291,222x = 638,536.50 × 638,536.50
4. Step 4: Simplify right side
   291,222x = 407,728,861,832.25
5. Step 5: Solve for x
   x = 407,728,861,832.25/291,222
6. Step 6: Final answer
   x = 1,400,062.02