Finding the Third Proportional to 99,158 and 217,090

Step by Step Solution

1. Step 1: Write the proportion equation
   99,158 : 217,090 = 217,090 : x
2. Step 2: Convert to fraction form
   99,158/217,090 = 217,090/x
3. Step 3: Cross multiply
   99,158x = 217,090 × 217,090
4. Step 4: Simplify right side
   99,158x = 47,128,068,100
5. Step 5: Solve for x
   x = 47,128,068,100/99,158
6. Step 6: Final answer
   x = 475,282.56