Finding the Third Proportional to 618,516 and 870,988.50

Step by Step Solution

1. Step 1: Write the proportion equation
   618,516 : 870,988.50 = 870,988.50 : x
2. Step 2: Convert to fraction form
   618,516/870,988.50 = 870,988.50/x
3. Step 3: Cross multiply
   618,516x = 870,988.50 × 870,988.50
4. Step 4: Simplify right side
   618,516x = 758,620,967,132.25
5. Step 5: Solve for x
   x = 758,620,967,132.25/618,516
6. Step 6: Final answer
   x = 1,226,517.94