Finding the Third Proportional to 222,431 and 489,141.50

Step by Step Solution

1. Step 1: Write the proportion equation
   222,431 : 489,141.50 = 489,141.50 : x
2. Step 2: Convert to fraction form
   222,431/489,141.50 = 489,141.50/x
3. Step 3: Cross multiply
   222,431x = 489,141.50 × 489,141.50
4. Step 4: Simplify right side
   222,431x = 239,259,407,022.25
5. Step 5: Solve for x
   x = 239,259,407,022.25/222,431
6. Step 6: Final answer
   x = 1,075,656.75