Finding the Fourth Proportional to 39,877.52, 55,028.50 and 21,971.52

Step by Step Solution

1. Step 1: Write the proportion equation
   39,877.52 : 55,028.50 = 21,971.52 : x
2. Step 2: Convert to fraction form
   39,877.52/55,028.50 = 21,971.52/x
3. Step 3: Cross multiply
   39,877.52x = 55,028.50 × 21,971.52
4. Step 4: Simplify right side
   39,877.52x = 1,209,059,733.39
5. Step 5: Solve for x
   x = 1,209,059,733.39/39,877.52
6. Step 6: Final answer
   x = 30,319.33