Finding the Third Proportional to 218,991 and 287,554.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,991 : 287,554.50 = 287,554.50 : x
2. Step 2: Convert to fraction form
   218,991/287,554.50 = 287,554.50/x
3. Step 3: Cross multiply
   218,991x = 287,554.50 × 287,554.50
4. Step 4: Simplify right side
   218,991x = 82,687,590,470.25
5. Step 5: Solve for x
   x = 82,687,590,470.25/218,991
6. Step 6: Final answer
   x = 377,584.42