Finding the Third Proportional to 215,858 and 335,091

Step by Step Solution

1. Step 1: Write the proportion equation
   215,858 : 335,091 = 335,091 : x
2. Step 2: Convert to fraction form
   215,858/335,091 = 335,091/x
3. Step 3: Cross multiply
   215,858x = 335,091 × 335,091
4. Step 4: Simplify right side
   215,858x = 112,285,978,281
5. Step 5: Solve for x
   x = 112,285,978,281/215,858
6. Step 6: Final answer
   x = 520,184.47