Finding the Fourth Proportional to 4,990.56, 7,487.56 and 3,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   4,990.56 : 7,487.56 = 3,139.52 : x
2. Step 2: Convert to fraction form
   4,990.56/7,487.56 = 3,139.52/x
3. Step 3: Cross multiply
   4,990.56x = 7,487.56 × 3,139.52
4. Step 4: Simplify right side
   4,990.56x = 23,507,344.37
5. Step 5: Solve for x
   x = 23,507,344.37/4,990.56
6. Step 6: Final answer
   x = 4,710.36