Finding the Third Proportional to 644,695.88 and 872,449.31

Step by Step Solution

1. Step 1: Write the proportion equation
   644,695.88 : 872,449.31 = 872,449.31 : x
2. Step 2: Convert to fraction form
   644,695.88/872,449.31 = 872,449.31/x
3. Step 3: Cross multiply
   644,695.88x = 872,449.31 × 872,449.31
4. Step 4: Simplify right side
   644,695.88x = 761,167,802,881.72
5. Step 5: Solve for x
   x = 761,167,802,881.72/644,695.88
6. Step 6: Final answer
   x = 1,180,661.82