Finding the Fourth Proportional to 4,978.89, 7,463.28 and 3,131.31

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.89 : 7,463.28 = 3,131.31 : x
2. Step 2: Convert to fraction form
   4,978.89/7,463.28 = 3,131.31/x
3. Step 3: Cross multiply
   4,978.89x = 7,463.28 × 3,131.31
4. Step 4: Simplify right side
   4,978.89x = 23,369,843.30
5. Step 5: Solve for x
   x = 23,369,843.30/4,978.89
6. Step 6: Final answer
   x = 4,693.79