Finding the Third Proportional to 90,123 and 129,819

Step by Step Solution

1. Step 1: Write the proportion equation
   90,123 : 129,819 = 129,819 : x
2. Step 2: Convert to fraction form
   90,123/129,819 = 129,819/x
3. Step 3: Cross multiply
   90,123x = 129,819 × 129,819
4. Step 4: Simplify right side
   90,123x = 16,852,972,761
5. Step 5: Solve for x
   x = 16,852,972,761/90,123
6. Step 6: Final answer
   x = 186,999.69