Finding the Fourth Proportional to 39,883.88, 55,039.46 and 21,978.46

Step by Step Solution

1. Step 1: Write the proportion equation
   39,883.88 : 55,039.46 = 21,978.46 : x
2. Step 2: Convert to fraction form
   39,883.88/55,039.46 = 21,978.46/x
3. Step 3: Cross multiply
   39,883.88x = 55,039.46 × 21,978.46
4. Step 4: Simplify right side
   39,883.88x = 1,209,682,570.03
5. Step 5: Solve for x
   x = 1,209,682,570.03/39,883.88
6. Step 6: Final answer
   x = 30,330.11