Finding the Third Proportional to 445,155.75 and 690,322.50

Step by Step Solution

1. Step 1: Write the proportion equation
   445,155.75 : 690,322.50 = 690,322.50 : x
2. Step 2: Convert to fraction form
   445,155.75/690,322.50 = 690,322.50/x
3. Step 3: Cross multiply
   445,155.75x = 690,322.50 × 690,322.50
4. Step 4: Simplify right side
   445,155.75x = 476,545,154,006.25
5. Step 5: Solve for x
   x = 476,545,154,006.25/445,155.75
6. Step 6: Final answer
   x = 1,070,513.31