Finding the Third Proportional to 218,988 and 287,550

Step by Step Solution

1. Step 1: Write the proportion equation
   218,988 : 287,550 = 287,550 : x
2. Step 2: Convert to fraction form
   218,988/287,550 = 287,550/x
3. Step 3: Cross multiply
   218,988x = 287,550 × 287,550
4. Step 4: Simplify right side
   218,988x = 82,685,002,500
5. Step 5: Solve for x
   x = 82,685,002,500/218,988
6. Step 6: Final answer
   x = 377,577.78