Finding the Fourth Proportional to 56,639.14, 78,162.33 and 31,146.01

Step by Step Solution

1. Step 1: Write the proportion equation
   56,639.14 : 78,162.33 = 31,146.01 : x
2. Step 2: Convert to fraction form
   56,639.14/78,162.33 = 31,146.01/x
3. Step 3: Cross multiply
   56,639.14x = 78,162.33 × 31,146.01
4. Step 4: Simplify right side
   56,639.14x = 2,434,444,711.80
5. Step 5: Solve for x
   x = 2,434,444,711.80/56,639.14
6. Step 6: Final answer
   x = 42,981.67