Finding the Third Proportional to 58,384 and 90,309

Step by Step Solution

1. Step 1: Write the proportion equation
   58,384 : 90,309 = 90,309 : x
2. Step 2: Convert to fraction form
   58,384/90,309 = 90,309/x
3. Step 3: Cross multiply
   58,384x = 90,309 × 90,309
4. Step 4: Simplify right side
   58,384x = 8,155,715,481
5. Step 5: Solve for x
   x = 8,155,715,481/58,384
6. Step 6: Final answer
   x = 139,690.93