Finding the Third Proportional to 111,908 and 218,148

Step by Step Solution

1. Step 1: Write the proportion equation
   111,908 : 218,148 = 218,148 : x
2. Step 2: Convert to fraction form
   111,908/218,148 = 218,148/x
3. Step 3: Cross multiply
   111,908x = 218,148 × 218,148
4. Step 4: Simplify right side
   111,908x = 47,588,549,904
5. Step 5: Solve for x
   x = 47,588,549,904/111,908
6. Step 6: Final answer
   x = 425,247.08