Finding the Third Proportional to 200,278.50 and 428,988

Step by Step Solution

1. Step 1: Write the proportion equation
   200,278.50 : 428,988 = 428,988 : x
2. Step 2: Convert to fraction form
   200,278.50/428,988 = 428,988/x
3. Step 3: Cross multiply
   200,278.50x = 428,988 × 428,988
4. Step 4: Simplify right side
   200,278.50x = 184,030,704,144
5. Step 5: Solve for x
   x = 184,030,704,144/200,278.50
6. Step 6: Final answer
   x = 918,873.99