Finding the Fourth Proportional to 56,638.27, 78,162.81 and 31,146.58

Step by Step Solution

1. Step 1: Write the proportion equation
   56,638.27 : 78,162.81 = 31,146.58 : x
2. Step 2: Convert to fraction form
   56,638.27/78,162.81 = 31,146.58/x
3. Step 3: Cross multiply
   56,638.27x = 78,162.81 × 31,146.58
4. Step 4: Simplify right side
   56,638.27x = 2,434,504,214.69
5. Step 5: Solve for x
   x = 2,434,504,214.69/56,638.27
6. Step 6: Final answer
   x = 42,983.38