Finding the Fourth Proportional to 3,886.17, 5,361.72 and 3,511.95

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.17 : 5,361.72 = 3,511.95 : x
2. Step 2: Convert to fraction form
   3,886.17/5,361.72 = 3,511.95/x
3. Step 3: Cross multiply
   3,886.17x = 5,361.72 × 3,511.95
4. Step 4: Simplify right side
   3,886.17x = 18,830,092.55
5. Step 5: Solve for x
   x = 18,830,092.55/3,886.17
6. Step 6: Final answer
   x = 4,845.41