Finding the Third Proportional to 188,158 and 402,210

Step by Step Solution

1. Step 1: Write the proportion equation
   188,158 : 402,210 = 402,210 : x
2. Step 2: Convert to fraction form
   188,158/402,210 = 402,210/x
3. Step 3: Cross multiply
   188,158x = 402,210 × 402,210
4. Step 4: Simplify right side
   188,158x = 161,772,884,100
5. Step 5: Solve for x
   x = 161,772,884,100/188,158
6. Step 6: Final answer
   x = 859,771.49