Finding the Third Proportional to 58,410 and 90,612

Step by Step Solution

1. Step 1: Write the proportion equation
   58,410 : 90,612 = 90,612 : x
2. Step 2: Convert to fraction form
   58,410/90,612 = 90,612/x
3. Step 3: Cross multiply
   58,410x = 90,612 × 90,612
4. Step 4: Simplify right side
   58,410x = 8,210,534,544
5. Step 5: Solve for x
   x = 8,210,534,544/58,410
6. Step 6: Final answer
   x = 140,567.28