Finding the Fourth Proportional to 39,779.83, 54,896.41 and 21,874.98

Step by Step Solution

1. Step 1: Write the proportion equation
   39,779.83 : 54,896.41 = 21,874.98 : x
2. Step 2: Convert to fraction form
   39,779.83/54,896.41 = 21,874.98/x
3. Step 3: Cross multiply
   39,779.83x = 54,896.41 × 21,874.98
4. Step 4: Simplify right side
   39,779.83x = 1,200,857,870.82
5. Step 5: Solve for x
   x = 1,200,857,870.82/39,779.83
6. Step 6: Final answer
   x = 30,187.61