Finding the Fourth Proportional to 57,786.50, 79,745.37 and 31,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,786.50 : 79,745.37 = 31,290.50 : x
2. Step 2: Convert to fraction form
   57,786.50/79,745.37 = 31,290.50/x
3. Step 3: Cross multiply
   57,786.50x = 79,745.37 × 31,290.50
4. Step 4: Simplify right side
   57,786.50x = 2,495,272,499.99
5. Step 5: Solve for x
   x = 2,495,272,499.99/57,786.50
6. Step 6: Final answer
   x = 43,180.89