Finding the Third Proportional to 290,146.50 and 443,805.75

Step by Step Solution

1. Step 1: Write the proportion equation
   290,146.50 : 443,805.75 = 443,805.75 : x
2. Step 2: Convert to fraction form
   290,146.50/443,805.75 = 443,805.75/x
3. Step 3: Cross multiply
   290,146.50x = 443,805.75 × 443,805.75
4. Step 4: Simplify right side
   290,146.50x = 196,963,543,733.06
5. Step 5: Solve for x
   x = 196,963,543,733.06/290,146.50
6. Step 6: Final answer
   x = 678,841.70