Finding the Third Proportional to 395,431.50 and 612,810

Step by Step Solution

1. Step 1: Write the proportion equation
   395,431.50 : 612,810 = 612,810 : x
2. Step 2: Convert to fraction form
   395,431.50/612,810 = 612,810/x
3. Step 3: Cross multiply
   395,431.50x = 612,810 × 612,810
4. Step 4: Simplify right side
   395,431.50x = 375,536,096,100
5. Step 5: Solve for x
   x = 375,536,096,100/395,431.50
6. Step 6: Final answer
   x = 949,686.85