Finding the Third Proportional to 55,780.31 and 84,979.13

Step by Step Solution

1. Step 1: Write the proportion equation
   55,780.31 : 84,979.13 = 84,979.13 : x
2. Step 2: Convert to fraction form
   55,780.31/84,979.13 = 84,979.13/x
3. Step 3: Cross multiply
   55,780.31x = 84,979.13 × 84,979.13
4. Step 4: Simplify right side
   55,780.31x = 7,221,451,685.77
5. Step 5: Solve for x
   x = 7,221,451,685.77/55,780.31
6. Step 6: Final answer
   x = 129,462.37