Finding the Third Proportional to 111,559.78 and 169,955.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111,559.78 : 169,955.72 = 169,955.72 : x
2. Step 2: Convert to fraction form
   111,559.78/169,955.72 = 169,955.72/x
3. Step 3: Cross multiply
   111,559.78x = 169,955.72 × 169,955.72
4. Step 4: Simplify right side
   111,559.78x = 28,884,946,335.83
5. Step 5: Solve for x
   x = 28,884,946,335.83/111,559.78
6. Step 6: Final answer
   x = 258,918.99