Finding the Fourth Proportional to 56,689.39, 78,231.59 and 31,195.86

Step by Step Solution

1. Step 1: Write the proportion equation
   56,689.39 : 78,231.59 = 31,195.86 : x
2. Step 2: Convert to fraction form
   56,689.39/78,231.59 = 31,195.86/x
3. Step 3: Cross multiply
   56,689.39x = 78,231.59 × 31,195.86
4. Step 4: Simplify right side
   56,689.39x = 2,440,501,729.22
5. Step 5: Solve for x
   x = 2,440,501,729.22/56,689.39
6. Step 6: Final answer
   x = 43,050.41