Finding the Third Proportional to 69,700.50 and 91,590.75

Step by Step Solution

1. Step 1: Write the proportion equation
   69,700.50 : 91,590.75 = 91,590.75 : x
2. Step 2: Convert to fraction form
   69,700.50/91,590.75 = 91,590.75/x
3. Step 3: Cross multiply
   69,700.50x = 91,590.75 × 91,590.75
4. Step 4: Simplify right side
   69,700.50x = 8,388,865,485.56
5. Step 5: Solve for x
   x = 8,388,865,485.56/69,700.50
6. Step 6: Final answer
   x = 120,355.89