Finding the Third Proportional to 188,103 and 402,090

Step by Step Solution

1. Step 1: Write the proportion equation
   188,103 : 402,090 = 402,090 : x
2. Step 2: Convert to fraction form
   188,103/402,090 = 402,090/x
3. Step 3: Cross multiply
   188,103x = 402,090 × 402,090
4. Step 4: Simplify right side
   188,103x = 161,676,368,100
5. Step 5: Solve for x
   x = 161,676,368,100/188,103
6. Step 6: Final answer
   x = 859,509.78