Finding the Third Proportional to 56,917.50 and 85,559.63

Step by Step Solution

1. Step 1: Write the proportion equation
   56,917.50 : 85,559.63 = 85,559.63 : x
2. Step 2: Convert to fraction form
   56,917.50/85,559.63 = 85,559.63/x
3. Step 3: Cross multiply
   56,917.50x = 85,559.63 × 85,559.63
4. Step 4: Simplify right side
   56,917.50x = 7,320,449,430.14
5. Step 5: Solve for x
   x = 7,320,449,430.14/56,917.50
6. Step 6: Final answer
   x = 128,615.09