Finding the Fourth Proportional to 39,868.42, 55,017.72 and 21,965.08

Step by Step Solution

1. Step 1: Write the proportion equation
   39,868.42 : 55,017.72 = 21,965.08 : x
2. Step 2: Convert to fraction form
   39,868.42/55,017.72 = 21,965.08/x
3. Step 3: Cross multiply
   39,868.42x = 55,017.72 × 21,965.08
4. Step 4: Simplify right side
   39,868.42x = 1,208,468,621.22
5. Step 5: Solve for x
   x = 1,208,468,621.22/39,868.42
6. Step 6: Final answer
   x = 30,311.42