Finding the Fourth Proportional to 7,120.98, 10,688.12 and 3,613.48

Step by Step Solution

1. Step 1: Write the proportion equation
   7,120.98 : 10,688.12 = 3,613.48 : x
2. Step 2: Convert to fraction form
   7,120.98/10,688.12 = 3,613.48/x
3. Step 3: Cross multiply
   7,120.98x = 10,688.12 × 3,613.48
4. Step 4: Simplify right side
   7,120.98x = 38,621,307.86
5. Step 5: Solve for x
   x = 38,621,307.86/7,120.98
6. Step 6: Final answer
   x = 5,423.59