Finding the Fourth Proportional to 5,174.31, 7,140.56 and 2,816.47

Step by Step Solution

1. Step 1: Write the proportion equation
   5,174.31 : 7,140.56 = 2,816.47 : x
2. Step 2: Convert to fraction form
   5,174.31/7,140.56 = 2,816.47/x
3. Step 3: Cross multiply
   5,174.31x = 7,140.56 × 2,816.47
4. Step 4: Simplify right side
   5,174.31x = 20,111,173.02
5. Step 5: Solve for x
   x = 20,111,173.02/5,174.31
6. Step 6: Final answer
   x = 3,886.74