Finding the Third Proportional to 61,485 and 90,039

Step by Step Solution

1. Step 1: Write the proportion equation
   61,485 : 90,039 = 90,039 : x
2. Step 2: Convert to fraction form
   61,485/90,039 = 90,039/x
3. Step 3: Cross multiply
   61,485x = 90,039 × 90,039
4. Step 4: Simplify right side
   61,485x = 8,107,021,521
5. Step 5: Solve for x
   x = 8,107,021,521/61,485
6. Step 6: Final answer
   x = 131,853.65