Finding the Third Proportional to 58,398 and 90,321

Step by Step Solution

1. Step 1: Write the proportion equation
   58,398 : 90,321 = 90,321 : x
2. Step 2: Convert to fraction form
   58,398/90,321 = 90,321/x
3. Step 3: Cross multiply
   58,398x = 90,321 × 90,321
4. Step 4: Simplify right side
   58,398x = 8,157,883,041
5. Step 5: Solve for x
   x = 8,157,883,041/58,398
6. Step 6: Final answer
   x = 139,694.56