Finding the Third Proportional to 90,994 and 139,390

Step by Step Solution

1. Step 1: Write the proportion equation
   90,994 : 139,390 = 139,390 : x
2. Step 2: Convert to fraction form
   90,994/139,390 = 139,390/x
3. Step 3: Cross multiply
   90,994x = 139,390 × 139,390
4. Step 4: Simplify right side
   90,994x = 19,429,572,100
5. Step 5: Solve for x
   x = 19,429,572,100/90,994
6. Step 6: Final answer
   x = 213,525.86