Finding the Fourth Proportional to 65,811.50, 90,819.78 and 37,131.12

Step by Step Solution

1. Step 1: Write the proportion equation
   65,811.50 : 90,819.78 = 37,131.12 : x
2. Step 2: Convert to fraction form
   65,811.50/90,819.78 = 37,131.12/x
3. Step 3: Cross multiply
   65,811.50x = 90,819.78 × 37,131.12
4. Step 4: Simplify right side
   65,811.50x = 3,372,240,149.55
5. Step 5: Solve for x
   x = 3,372,240,149.55/65,811.50
6. Step 6: Final answer
   x = 51,240.89