Finding the Third Proportional to 660,105 and 991,615.50

Step by Step Solution

1. Step 1: Write the proportion equation
   660,105 : 991,615.50 = 991,615.50 : x
2. Step 2: Convert to fraction form
   660,105/991,615.50 = 991,615.50/x
3. Step 3: Cross multiply
   660,105x = 991,615.50 × 991,615.50
4. Step 4: Simplify right side
   660,105x = 983,301,299,840.25
5. Step 5: Solve for x
   x = 983,301,299,840.25/660,105
6. Step 6: Final answer
   x = 1,489,613.47