Finding the Fourth Proportional to 55,131.21, 76,078.77 and 31,259.50

Step by Step Solution

1. Step 1: Write the proportion equation
   55,131.21 : 76,078.77 = 31,259.50 : x
2. Step 2: Convert to fraction form
   55,131.21/76,078.77 = 31,259.50/x
3. Step 3: Cross multiply
   55,131.21x = 76,078.77 × 31,259.50
4. Step 4: Simplify right side
   55,131.21x = 2,378,184,310.82
5. Step 5: Solve for x
   x = 2,378,184,310.82/55,131.21
6. Step 6: Final answer
   x = 43,136.81