Finding the Fourth Proportional to 57,475.32, 86,178.38 and 21,939

Step by Step Solution

1. Step 1: Write the proportion equation
   57,475.32 : 86,178.38 = 21,939 : x
2. Step 2: Convert to fraction form
   57,475.32/86,178.38 = 21,939/x
3. Step 3: Cross multiply
   57,475.32x = 86,178.38 × 21,939
4. Step 4: Simplify right side
   57,475.32x = 1,890,667,478.82
5. Step 5: Solve for x
   x = 1,890,667,478.82/57,475.32
6. Step 6: Final answer
   x = 32,895.29