Finding the Third Proportional to 147,457.50 and 316,419

Step by Step Solution

1. Step 1: Write the proportion equation
   147,457.50 : 316,419 = 316,419 : x
2. Step 2: Convert to fraction form
   147,457.50/316,419 = 316,419/x
3. Step 3: Cross multiply
   147,457.50x = 316,419 × 316,419
4. Step 4: Simplify right side
   147,457.50x = 100,120,983,561
5. Step 5: Solve for x
   x = 100,120,983,561/147,457.50
6. Step 6: Final answer
   x = 678,981.97