Finding the Third Proportional to 58,603.50 and 86,811.75

Step by Step Solution

1. Step 1: Write the proportion equation
   58,603.50 : 86,811.75 = 86,811.75 : x
2. Step 2: Convert to fraction form
   58,603.50/86,811.75 = 86,811.75/x
3. Step 3: Cross multiply
   58,603.50x = 86,811.75 × 86,811.75
4. Step 4: Simplify right side
   58,603.50x = 7,536,279,938.06
5. Step 5: Solve for x
   x = 7,536,279,938.06/58,603.50
6. Step 6: Final answer
   x = 128,597.78