Finding the Third Proportional to 296,188.50 and 639,572

Step by Step Solution

1. Step 1: Write the proportion equation
   296,188.50 : 639,572 = 639,572 : x
2. Step 2: Convert to fraction form
   296,188.50/639,572 = 639,572/x
3. Step 3: Cross multiply
   296,188.50x = 639,572 × 639,572
4. Step 4: Simplify right side
   296,188.50x = 409,052,343,184
5. Step 5: Solve for x
   x = 409,052,343,184/296,188.50
6. Step 6: Final answer
   x = 1,381,054.10