Finding the Third Proportional to 149,818 and 321,869.50

Step by Step Solution

1. Step 1: Write the proportion equation
   149,818 : 321,869.50 = 321,869.50 : x
2. Step 2: Convert to fraction form
   149,818/321,869.50 = 321,869.50/x
3. Step 3: Cross multiply
   149,818x = 321,869.50 × 321,869.50
4. Step 4: Simplify right side
   149,818x = 103,599,975,030.25
5. Step 5: Solve for x
   x = 103,599,975,030.25/149,818
6. Step 6: Final answer
   x = 691,505.53