Finding the Fourth Proportional to 56,636.26, 78,159 and 31,143.67

Step by Step Solution

1. Step 1: Write the proportion equation
   56,636.26 : 78,159 = 31,143.67 : x
2. Step 2: Convert to fraction form
   56,636.26/78,159 = 31,143.67/x
3. Step 3: Cross multiply
   56,636.26x = 78,159 × 31,143.67
4. Step 4: Simplify right side
   56,636.26x = 2,434,158,103.53
5. Step 5: Solve for x
   x = 2,434,158,103.53/56,636.26
6. Step 6: Final answer
   x = 42,978.79