Finding the Fourth Proportional to 57,914.91, 86,870.21 and 20,978.91

Step by Step Solution

1. Step 1: Write the proportion equation
   57,914.91 : 86,870.21 = 20,978.91 : x
2. Step 2: Convert to fraction form
   57,914.91/86,870.21 = 20,978.91/x
3. Step 3: Cross multiply
   57,914.91x = 86,870.21 × 20,978.91
4. Step 4: Simplify right side
   57,914.91x = 1,822,442,212.38
5. Step 5: Solve for x
   x = 1,822,442,212.38/57,914.91
6. Step 6: Final answer
   x = 31,467.58