Finding the Fourth Proportional to 5,139.54, 7,709.58 and 1,854.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.54 : 7,709.58 = 1,854.72 : x
2. Step 2: Convert to fraction form
   5,139.54/7,709.58 = 1,854.72/x
3. Step 3: Cross multiply
   5,139.54x = 7,709.58 × 1,854.72
4. Step 4: Simplify right side
   5,139.54x = 14,299,112.22
5. Step 5: Solve for x
   x = 14,299,112.22/5,139.54
6. Step 6: Final answer
   x = 2,782.18