Finding the Third Proportional to 20,120 and 42,838.75

Step by Step Solution

1. Step 1: Write the proportion equation
   20,120 : 42,838.75 = 42,838.75 : x
2. Step 2: Convert to fraction form
   20,120/42,838.75 = 42,838.75/x
3. Step 3: Cross multiply
   20,120x = 42,838.75 × 42,838.75
4. Step 4: Simplify right side
   20,120x = 1,835,158,501.56
5. Step 5: Solve for x
   x = 1,835,158,501.56/20,120
6. Step 6: Final answer
   x = 91,210.66