Finding the Fourth Proportional to 56,928.81, 78,551.40 and 39,984.82

Step by Step Solution

1. Step 1: Write the proportion equation
   56,928.81 : 78,551.40 = 39,984.82 : x
2. Step 2: Convert to fraction form
   56,928.81/78,551.40 = 39,984.82/x
3. Step 3: Cross multiply
   56,928.81x = 78,551.40 × 39,984.82
4. Step 4: Simplify right side
   56,928.81x = 3,140,863,760.25
5. Step 5: Solve for x
   x = 3,140,863,760.25/56,928.81
6. Step 6: Final answer
   x = 55,171.78