Finding the Third Proportional to 415,575 and 554,620.50

Step by Step Solution

1. Step 1: Write the proportion equation
   415,575 : 554,620.50 = 554,620.50 : x
2. Step 2: Convert to fraction form
   415,575/554,620.50 = 554,620.50/x
3. Step 3: Cross multiply
   415,575x = 554,620.50 × 554,620.50
4. Step 4: Simplify right side
   415,575x = 307,603,899,020.25
5. Step 5: Solve for x
   x = 307,603,899,020.25/415,575
6. Step 6: Final answer
   x = 740,188.65