Finding the Third Proportional to 300,138 and 708,487.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,138 : 708,487.50 = 708,487.50 : x
2. Step 2: Convert to fraction form
   300,138/708,487.50 = 708,487.50/x
3. Step 3: Cross multiply
   300,138x = 708,487.50 × 708,487.50
4. Step 4: Simplify right side
   300,138x = 501,954,537,656.25
5. Step 5: Solve for x
   x = 501,954,537,656.25/300,138
6. Step 6: Final answer
   x = 1,672,412.48