Finding the Fourth Proportional to 7,345.98, 10,137.39 and 3,988.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,345.98 : 10,137.39 = 3,988.72 : x
2. Step 2: Convert to fraction form
   7,345.98/10,137.39 = 3,988.72/x
3. Step 3: Cross multiply
   7,345.98x = 10,137.39 × 3,988.72
4. Step 4: Simplify right side
   7,345.98x = 40,435,230.39
5. Step 5: Solve for x
   x = 40,435,230.39/7,345.98
6. Step 6: Final answer
   x = 5,504.40