Finding the Third Proportional to 196,858.50 and 406,840

Step by Step Solution

1. Step 1: Write the proportion equation
   196,858.50 : 406,840 = 406,840 : x
2. Step 2: Convert to fraction form
   196,858.50/406,840 = 406,840/x
3. Step 3: Cross multiply
   196,858.50x = 406,840 × 406,840
4. Step 4: Simplify right side
   196,858.50x = 165,518,785,600
5. Step 5: Solve for x
   x = 165,518,785,600/196,858.50
6. Step 6: Final answer
   x = 840,800.81