Finding the Fourth Proportional to 39,772.72, 54,886.72 and 21,867.86

Step by Step Solution

1. Step 1: Write the proportion equation
   39,772.72 : 54,886.72 = 21,867.86 : x
2. Step 2: Convert to fraction form
   39,772.72/54,886.72 = 21,867.86/x
3. Step 3: Cross multiply
   39,772.72x = 54,886.72 × 21,867.86
4. Step 4: Simplify right side
   39,772.72x = 1,200,255,108.82
5. Step 5: Solve for x
   x = 1,200,255,108.82/39,772.72
6. Step 6: Final answer
   x = 30,177.85