Finding the Third Proportional to 42,379.50 and 57,556.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,379.50 : 57,556.50 = 57,556.50 : x
2. Step 2: Convert to fraction form
   42,379.50/57,556.50 = 57,556.50/x
3. Step 3: Cross multiply
   42,379.50x = 57,556.50 × 57,556.50
4. Step 4: Simplify right side
   42,379.50x = 3,312,750,692.25
5. Step 5: Solve for x
   x = 3,312,750,692.25/42,379.50
6. Step 6: Final answer
   x = 78,168.71