Finding the Third Proportional to 128,160 and 299,436.75

Step by Step Solution

1. Step 1: Write the proportion equation
   128,160 : 299,436.75 = 299,436.75 : x
2. Step 2: Convert to fraction form
   128,160/299,436.75 = 299,436.75/x
3. Step 3: Cross multiply
   128,160x = 299,436.75 × 299,436.75
4. Step 4: Simplify right side
   128,160x = 89,662,367,250.56
5. Step 5: Solve for x
   x = 89,662,367,250.56/128,160
6. Step 6: Final answer
   x = 699,612.73