Finding the Third Proportional to 132,639 and 286,384.50

Step by Step Solution

1. Step 1: Write the proportion equation
   132,639 : 286,384.50 = 286,384.50 : x
2. Step 2: Convert to fraction form
   132,639/286,384.50 = 286,384.50/x
3. Step 3: Cross multiply
   132,639x = 286,384.50 × 286,384.50
4. Step 4: Simplify right side
   132,639x = 82,016,081,840.25
5. Step 5: Solve for x
   x = 82,016,081,840.25/132,639
6. Step 6: Final answer
   x = 618,340.62