Finding the Fourth Proportional to 4,111.32, 5,670.42 and 3,639.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,111.32 : 5,670.42 = 3,639.72 : x
2. Step 2: Convert to fraction form
   4,111.32/5,670.42 = 3,639.72/x
3. Step 3: Cross multiply
   4,111.32x = 5,670.42 × 3,639.72
4. Step 4: Simplify right side
   4,111.32x = 20,638,741.08
5. Step 5: Solve for x
   x = 20,638,741.08/4,111.32
6. Step 6: Final answer
   x = 5,019.98