Finding the Fourth Proportional to 4,987.98, 7,478.64 and 2,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   4,987.98 : 7,478.64 = 2,389.50 : x
2. Step 2: Convert to fraction form
   4,987.98/7,478.64 = 2,389.50/x
3. Step 3: Cross multiply
   4,987.98x = 7,478.64 × 2,389.50
4. Step 4: Simplify right side
   4,987.98x = 17,870,210.28
5. Step 5: Solve for x
   x = 17,870,210.28/4,987.98
6. Step 6: Final answer
   x = 3,582.65