Finding the Third Proportional to 263,457 and 390,613.50

Step by Step Solution

1. Step 1: Write the proportion equation
   263,457 : 390,613.50 = 390,613.50 : x
2. Step 2: Convert to fraction form
   263,457/390,613.50 = 390,613.50/x
3. Step 3: Cross multiply
   263,457x = 390,613.50 × 390,613.50
4. Step 4: Simplify right side
   263,457x = 152,578,906,382.25
5. Step 5: Solve for x
   x = 152,578,906,382.25/263,457
6. Step 6: Final answer
   x = 579,141.59