Finding the Fourth Proportional to 5,180.61, 7,148.70 and 2,911.59

Step by Step Solution

1. Step 1: Write the proportion equation
   5,180.61 : 7,148.70 = 2,911.59 : x
2. Step 2: Convert to fraction form
   5,180.61/7,148.70 = 2,911.59/x
3. Step 3: Cross multiply
   5,180.61x = 7,148.70 × 2,911.59
4. Step 4: Simplify right side
   5,180.61x = 20,814,065.56
5. Step 5: Solve for x
   x = 20,814,065.56/5,180.61
6. Step 6: Final answer
   x = 4,017.69