Finding the Third Proportional to 307,152 and 638,826.75

Step by Step Solution

1. Step 1: Write the proportion equation
   307,152 : 638,826.75 = 638,826.75 : x
2. Step 2: Convert to fraction form
   307,152/638,826.75 = 638,826.75/x
3. Step 3: Cross multiply
   307,152x = 638,826.75 × 638,826.75
4. Step 4: Simplify right side
   307,152x = 408,099,616,515.56
5. Step 5: Solve for x
   x = 408,099,616,515.56/307,152
6. Step 6: Final answer
   x = 1,328,656.88