Finding the Third Proportional to 58,390 and 90,320

Step by Step Solution

1. Step 1: Write the proportion equation
   58,390 : 90,320 = 90,320 : x
2. Step 2: Convert to fraction form
   58,390/90,320 = 90,320/x
3. Step 3: Cross multiply
   58,390x = 90,320 × 90,320
4. Step 4: Simplify right side
   58,390x = 8,157,702,400
5. Step 5: Solve for x
   x = 8,157,702,400/58,390
6. Step 6: Final answer
   x = 139,710.61