Finding the Fourth Proportional to 7,319.90, 10,978.72 and 2,389.54

Step by Step Solution

1. Step 1: Write the proportion equation
   7,319.90 : 10,978.72 = 2,389.54 : x
2. Step 2: Convert to fraction form
   7,319.90/10,978.72 = 2,389.54/x
3. Step 3: Cross multiply
   7,319.90x = 10,978.72 × 2,389.54
4. Step 4: Simplify right side
   7,319.90x = 26,234,090.59
5. Step 5: Solve for x
   x = 26,234,090.59/7,319.90
6. Step 6: Final answer
   x = 3,583.94