Finding the Fourth Proportional to 39,900.78, 55,062.72 and 21,995.46

Step by Step Solution

1. Step 1: Write the proportion equation
   39,900.78 : 55,062.72 = 21,995.46 : x
2. Step 2: Convert to fraction form
   39,900.78/55,062.72 = 21,995.46/x
3. Step 3: Cross multiply
   39,900.78x = 55,062.72 × 21,995.46
4. Step 4: Simplify right side
   39,900.78x = 1,211,129,855.25
5. Step 5: Solve for x
   x = 1,211,129,855.25/39,900.78
6. Step 6: Final answer
   x = 30,353.54