Finding the Third Proportional to 915,634.50 and 1,988,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   915,634.50 : 1,988,890.50 = 1,988,890.50 : x
2. Step 2: Convert to fraction form
   915,634.50/1,988,890.50 = 1,988,890.50/x
3. Step 3: Cross multiply
   915,634.50x = 1,988,890.50 × 1,988,890.50
4. Step 4: Simplify right side
   915,634.50x = 3,955,685,420,990.25
5. Step 5: Solve for x
   x = 3,955,685,420,990.25/915,634.50
6. Step 6: Final answer
   x = 4,320,157.68