Finding the Third Proportional to 257,703 and 390,118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,703 : 390,118.50 = 390,118.50 : x
2. Step 2: Convert to fraction form
   257,703/390,118.50 = 390,118.50/x
3. Step 3: Cross multiply
   257,703x = 390,118.50 × 390,118.50
4. Step 4: Simplify right side
   257,703x = 152,192,444,042.25
5. Step 5: Solve for x
   x = 152,192,444,042.25/257,703
6. Step 6: Final answer
   x = 590,573.04