Finding the Third Proportional to 66,888.94 and 91,721.72

Step by Step Solution

1. Step 1: Write the proportion equation
   66,888.94 : 91,721.72 = 91,721.72 : x
2. Step 2: Convert to fraction form
   66,888.94/91,721.72 = 91,721.72/x
3. Step 3: Cross multiply
   66,888.94x = 91,721.72 × 91,721.72
4. Step 4: Simplify right side
   66,888.94x = 8,412,873,690.45
5. Step 5: Solve for x
   x = 8,412,873,690.45/66,888.94
6. Step 6: Final answer
   x = 125,773.77