Finding the Fourth Proportional to 11,375.42, 17,065.55 and 3,980.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,375.42 : 17,065.55 = 3,980.12 : x
2. Step 2: Convert to fraction form
   11,375.42/17,065.55 = 3,980.12/x
3. Step 3: Cross multiply
   11,375.42x = 17,065.55 × 3,980.12
4. Step 4: Simplify right side
   11,375.42x = 67,922,861.49
5. Step 5: Solve for x
   x = 67,922,861.49/11,375.42
6. Step 6: Final answer
   x = 5,971.02