Finding the Fourth Proportional to 12,779.98, 19,166.83 and 4,458.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,779.98 : 19,166.83 = 4,458.78 : x
2. Step 2: Convert to fraction form
   12,779.98/19,166.83 = 4,458.78/x
3. Step 3: Cross multiply
   12,779.98x = 19,166.83 × 4,458.78
4. Step 4: Simplify right side
   12,779.98x = 85,460,667.12
5. Step 5: Solve for x
   x = 85,460,667.12/12,779.98
6. Step 6: Final answer
   x = 6,687.07