Finding the Third Proportional to 51,804 and 81,870.75

Step by Step Solution

1. Step 1: Write the proportion equation
   51,804 : 81,870.75 = 81,870.75 : x
2. Step 2: Convert to fraction form
   51,804/81,870.75 = 81,870.75/x
3. Step 3: Cross multiply
   51,804x = 81,870.75 × 81,870.75
4. Step 4: Simplify right side
   51,804x = 6,702,819,705.56
5. Step 5: Solve for x
   x = 6,702,819,705.56/51,804
6. Step 6: Final answer
   x = 129,388.07