Finding the Third Proportional to 290,815.50 and 608,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,815.50 : 608,116.50 = 608,116.50 : x
2. Step 2: Convert to fraction form
   290,815.50/608,116.50 = 608,116.50/x
3. Step 3: Cross multiply
   290,815.50x = 608,116.50 × 608,116.50
4. Step 4: Simplify right side
   290,815.50x = 369,805,677,572.25
5. Step 5: Solve for x
   x = 369,805,677,572.25/290,815.50
6. Step 6: Final answer
   x = 1,271,616.12