Finding the Third Proportional to 55,779.75 and 84,976.50

Step by Step Solution

1. Step 1: Write the proportion equation
   55,779.75 : 84,976.50 = 84,976.50 : x
2. Step 2: Convert to fraction form
   55,779.75/84,976.50 = 84,976.50/x
3. Step 3: Cross multiply
   55,779.75x = 84,976.50 × 84,976.50
4. Step 4: Simplify right side
   55,779.75x = 7,221,005,552.25
5. Step 5: Solve for x
   x = 7,221,005,552.25/55,779.75
6. Step 6: Final answer
   x = 129,455.68