Finding the Third Proportional to 251,920.50 and 390,051

Step by Step Solution

1. Step 1: Write the proportion equation
   251,920.50 : 390,051 = 390,051 : x
2. Step 2: Convert to fraction form
   251,920.50/390,051 = 390,051/x
3. Step 3: Cross multiply
   251,920.50x = 390,051 × 390,051
4. Step 4: Simplify right side
   251,920.50x = 152,139,782,601
5. Step 5: Solve for x
   x = 152,139,782,601/251,920.50
6. Step 6: Final answer
   x = 603,919.82