Finding the Third Proportional to 231,672 and 369,990

Step by Step Solution

1. Step 1: Write the proportion equation
   231,672 : 369,990 = 369,990 : x
2. Step 2: Convert to fraction form
   231,672/369,990 = 369,990/x
3. Step 3: Cross multiply
   231,672x = 369,990 × 369,990
4. Step 4: Simplify right side
   231,672x = 136,892,600,100
5. Step 5: Solve for x
   x = 136,892,600,100/231,672
6. Step 6: Final answer
   x = 590,889.71