Finding the Third Proportional to 297,071.50 and 641,490.50

Step by Step Solution

1. Step 1: Write the proportion equation
   297,071.50 : 641,490.50 = 641,490.50 : x
2. Step 2: Convert to fraction form
   297,071.50/641,490.50 = 641,490.50/x
3. Step 3: Cross multiply
   297,071.50x = 641,490.50 × 641,490.50
4. Step 4: Simplify right side
   297,071.50x = 411,510,061,590.25
5. Step 5: Solve for x
   x = 411,510,061,590.25/297,071.50
6. Step 6: Final answer
   x = 1,385,222.28