Finding the Fourth Proportional to 39,867.86, 55,017.33 and 21,964.82

Step by Step Solution

1. Step 1: Write the proportion equation
   39,867.86 : 55,017.33 = 21,964.82 : x
2. Step 2: Convert to fraction form
   39,867.86/55,017.33 = 21,964.82/x
3. Step 3: Cross multiply
   39,867.86x = 55,017.33 × 21,964.82
4. Step 4: Simplify right side
   39,867.86x = 1,208,445,750.33
5. Step 5: Solve for x
   x = 1,208,445,750.33/39,867.86
6. Step 6: Final answer
   x = 30,311.28