Finding the Third Proportional to 58,520 and 90,412

Step by Step Solution

1. Step 1: Write the proportion equation
   58,520 : 90,412 = 90,412 : x
2. Step 2: Convert to fraction form
   58,520/90,412 = 90,412/x
3. Step 3: Cross multiply
   58,520x = 90,412 × 90,412
4. Step 4: Simplify right side
   58,520x = 8,174,329,744
5. Step 5: Solve for x
   x = 8,174,329,744/58,520
6. Step 6: Final answer
   x = 139,684.38