Finding the Third Proportional to 55,781.50 and 84,980.75

Step by Step Solution

1. Step 1: Write the proportion equation
   55,781.50 : 84,980.75 = 84,980.75 : x
2. Step 2: Convert to fraction form
   55,781.50/84,980.75 = 84,980.75/x
3. Step 3: Cross multiply
   55,781.50x = 84,980.75 × 84,980.75
4. Step 4: Simplify right side
   55,781.50x = 7,221,727,870.56
5. Step 5: Solve for x
   x = 7,221,727,870.56/55,781.50
6. Step 6: Final answer
   x = 129,464.57