Finding the Fourth Proportional to 39,778.83, 54,895.03 and 21,873.98

Step by Step Solution

1. Step 1: Write the proportion equation
   39,778.83 : 54,895.03 = 21,873.98 : x
2. Step 2: Convert to fraction form
   39,778.83/54,895.03 = 21,873.98/x
3. Step 3: Cross multiply
   39,778.83x = 54,895.03 × 21,873.98
4. Step 4: Simplify right side
   39,778.83x = 1,200,772,870.87
5. Step 5: Solve for x
   x = 1,200,772,870.87/39,778.83
6. Step 6: Final answer
   x = 30,186.23