Finding the Fourth Proportional to 57,019.50, 78,689.34 and 31,869

Step by Step Solution

1. Step 1: Write the proportion equation
   57,019.50 : 78,689.34 = 31,869 : x
2. Step 2: Convert to fraction form
   57,019.50/78,689.34 = 31,869/x
3. Step 3: Cross multiply
   57,019.50x = 78,689.34 × 31,869
4. Step 4: Simplify right side
   57,019.50x = 2,507,750,576.46
5. Step 5: Solve for x
   x = 2,507,750,576.46/57,019.50
6. Step 6: Final answer
   x = 43,980.58