Finding the Third Proportional to 315,616.50 and 456,840

Step by Step Solution

1. Step 1: Write the proportion equation
   315,616.50 : 456,840 = 456,840 : x
2. Step 2: Convert to fraction form
   315,616.50/456,840 = 456,840/x
3. Step 3: Cross multiply
   315,616.50x = 456,840 × 456,840
4. Step 4: Simplify right side
   315,616.50x = 208,702,785,600
5. Step 5: Solve for x
   x = 208,702,785,600/315,616.50
6. Step 6: Final answer
   x = 661,254.36