Finding the Third Proportional to 239,131.50 and 357,420

Step by Step Solution

1. Step 1: Write the proportion equation
   239,131.50 : 357,420 = 357,420 : x
2. Step 2: Convert to fraction form
   239,131.50/357,420 = 357,420/x
3. Step 3: Cross multiply
   239,131.50x = 357,420 × 357,420
4. Step 4: Simplify right side
   239,131.50x = 127,749,056,400
5. Step 5: Solve for x
   x = 127,749,056,400/239,131.50
6. Step 6: Final answer
   x = 534,220.95