Finding the Fourth Proportional to 56,958.42, 78,639.57 and 50,979.72

Step by Step Solution

1. Step 1: Write the proportion equation
   56,958.42 : 78,639.57 = 50,979.72 : x
2. Step 2: Convert to fraction form
   56,958.42/78,639.57 = 50,979.72/x
3. Step 3: Cross multiply
   56,958.42x = 78,639.57 × 50,979.72
4. Step 4: Simplify right side
   56,958.42x = 4,009,023,259.52
5. Step 5: Solve for x
   x = 4,009,023,259.52/56,958.42
6. Step 6: Final answer
   x = 70,385.09