Finding the Third Proportional to 90,011.25 and 120,780

Step by Step Solution

1. Step 1: Write the proportion equation
   90,011.25 : 120,780 = 120,780 : x
2. Step 2: Convert to fraction form
   90,011.25/120,780 = 120,780/x
3. Step 3: Cross multiply
   90,011.25x = 120,780 × 120,780
4. Step 4: Simplify right side
   90,011.25x = 14,587,808,400
5. Step 5: Solve for x
   x = 14,587,808,400/90,011.25
6. Step 6: Final answer
   x = 162,066.50