Finding the Fourth Proportional to 4,111.86, 6,156.18 and 3,138.60

Step by Step Solution

1. Step 1: Write the proportion equation
   4,111.86 : 6,156.18 = 3,138.60 : x
2. Step 2: Convert to fraction form
   4,111.86/6,156.18 = 3,138.60/x
3. Step 3: Cross multiply
   4,111.86x = 6,156.18 × 3,138.60
4. Step 4: Simplify right side
   4,111.86x = 19,321,786.55
5. Step 5: Solve for x
   x = 19,321,786.55/4,111.86
6. Step 6: Final answer
   x = 4,699.04