Finding the Third Proportional to 199,512.50 and 430,678

Step by Step Solution

1. Step 1: Write the proportion equation
   199,512.50 : 430,678 = 430,678 : x
2. Step 2: Convert to fraction form
   199,512.50/430,678 = 430,678/x
3. Step 3: Cross multiply
   199,512.50x = 430,678 × 430,678
4. Step 4: Simplify right side
   199,512.50x = 185,483,539,684
5. Step 5: Solve for x
   x = 185,483,539,684/199,512.50
6. Step 6: Final answer
   x = 929,683.80