Finding the Fourth Proportional to 39,870, 55,019.52 and 21,964.82

Step by Step Solution

1. Step 1: Write the proportion equation
   39,870 : 55,019.52 = 21,964.82 : x
2. Step 2: Convert to fraction form
   39,870/55,019.52 = 21,964.82/x
3. Step 3: Cross multiply
   39,870x = 55,019.52 × 21,964.82
4. Step 4: Simplify right side
   39,870x = 1,208,493,578.19
5. Step 5: Solve for x
   x = 1,208,493,578.19/39,870
6. Step 6: Final answer
   x = 30,310.85