Finding the Third Proportional to 83,920.13 and 128,071.88

Step by Step Solution

1. Step 1: Write the proportion equation
   83,920.13 : 128,071.88 = 128,071.88 : x
2. Step 2: Convert to fraction form
   83,920.13/128,071.88 = 128,071.88/x
3. Step 3: Cross multiply
   83,920.13x = 128,071.88 × 128,071.88
4. Step 4: Simplify right side
   83,920.13x = 16,402,405,166.02
5. Step 5: Solve for x
   x = 16,402,405,166.02/83,920.13
6. Step 6: Final answer
   x = 195,452.58