Finding the Third Proportional to 417,013.50 and 690,222

Step by Step Solution

1. Step 1: Write the proportion equation
   417,013.50 : 690,222 = 690,222 : x
2. Step 2: Convert to fraction form
   417,013.50/690,222 = 690,222/x
3. Step 3: Cross multiply
   417,013.50x = 690,222 × 690,222
4. Step 4: Simplify right side
   417,013.50x = 476,406,409,284
5. Step 5: Solve for x
   x = 476,406,409,284/417,013.50
6. Step 6: Final answer
   x = 1,142,424.43