Finding the Third Proportional to 311,487.75 and 458,478

Step by Step Solution

1. Step 1: Write the proportion equation
   311,487.75 : 458,478 = 458,478 : x
2. Step 2: Convert to fraction form
   311,487.75/458,478 = 458,478/x
3. Step 3: Cross multiply
   311,487.75x = 458,478 × 458,478
4. Step 4: Simplify right side
   311,487.75x = 210,202,076,484
5. Step 5: Solve for x
   x = 210,202,076,484/311,487.75
6. Step 6: Final answer
   x = 674,832.56