Finding the Fourth Proportional to 3,859.98, 5,791.86 and 1,779.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.98 : 5,791.86 = 1,779.72 : x
2. Step 2: Convert to fraction form
   3,859.98/5,791.86 = 1,779.72/x
3. Step 3: Cross multiply
   3,859.98x = 5,791.86 × 1,779.72
4. Step 4: Simplify right side
   3,859.98x = 10,307,889.08
5. Step 5: Solve for x
   x = 10,307,889.08/3,859.98
6. Step 6: Final answer
   x = 2,670.45