Finding the Fourth Proportional to 57,020.52, 78,690.72 and 31,870

Step by Step Solution

1. Step 1: Write the proportion equation
   57,020.52 : 78,690.72 = 31,870 : x
2. Step 2: Convert to fraction form
   57,020.52/78,690.72 = 31,870/x
3. Step 3: Cross multiply
   57,020.52x = 78,690.72 × 31,870
4. Step 4: Simplify right side
   57,020.52x = 2,507,873,246.40
5. Step 5: Solve for x
   x = 2,507,873,246.40/57,020.52
6. Step 6: Final answer
   x = 43,981.94