Finding the Third Proportional to 58,640 and 90,216

Step by Step Solution

1. Step 1: Write the proportion equation
   58,640 : 90,216 = 90,216 : x
2. Step 2: Convert to fraction form
   58,640/90,216 = 90,216/x
3. Step 3: Cross multiply
   58,640x = 90,216 × 90,216
4. Step 4: Simplify right side
   58,640x = 8,138,926,656
5. Step 5: Solve for x
   x = 8,138,926,656/58,640
6. Step 6: Final answer
   x = 138,794.79