Finding the Third Proportional to 51,354 and 78,900

Step by Step Solution

1. Step 1: Write the proportion equation
   51,354 : 78,900 = 78,900 : x
2. Step 2: Convert to fraction form
   51,354/78,900 = 78,900/x
3. Step 3: Cross multiply
   51,354x = 78,900 × 78,900
4. Step 4: Simplify right side
   51,354x = 6,225,210,000
5. Step 5: Solve for x
   x = 6,225,210,000/51,354
6. Step 6: Final answer
   x = 121,221.52