Finding the Third Proportional to 342,913.50 and 487,012.50

Step by Step Solution

1. Step 1: Write the proportion equation
   342,913.50 : 487,012.50 = 487,012.50 : x
2. Step 2: Convert to fraction form
   342,913.50/487,012.50 = 487,012.50/x
3. Step 3: Cross multiply
   342,913.50x = 487,012.50 × 487,012.50
4. Step 4: Simplify right side
   342,913.50x = 237,181,175,156.25
5. Step 5: Solve for x
   x = 237,181,175,156.25/342,913.50
6. Step 6: Final answer
   x = 691,664.74