Finding the Third Proportional to 51,306 and 78,808.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,306 : 78,808.50 = 78,808.50 : x
2. Step 2: Convert to fraction form
   51,306/78,808.50 = 78,808.50/x
3. Step 3: Cross multiply
   51,306x = 78,808.50 × 78,808.50
4. Step 4: Simplify right side
   51,306x = 6,210,779,672.25
5. Step 5: Solve for x
   x = 6,210,779,672.25/51,306
6. Step 6: Final answer
   x = 121,053.67