Finding the Fourth Proportional to 51,550.68, 77,191.56 and 28,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,550.68 : 77,191.56 = 28,128.72 : x
2. Step 2: Convert to fraction form
   51,550.68/77,191.56 = 28,128.72/x
3. Step 3: Cross multiply
   51,550.68x = 77,191.56 × 28,128.72
4. Step 4: Simplify right side
   51,550.68x = 2,171,299,777.60
5. Step 5: Solve for x
   x = 2,171,299,777.60/51,550.68
6. Step 6: Final answer
   x = 42,119.71