Finding the Fourth Proportional to 6,131.61, 8,454.15 and 5,185.71

Step by Step Solution

1. Step 1: Write the proportion equation
   6,131.61 : 8,454.15 = 5,185.71 : x
2. Step 2: Convert to fraction form
   6,131.61/8,454.15 = 5,185.71/x
3. Step 3: Cross multiply
   6,131.61x = 8,454.15 × 5,185.71
4. Step 4: Simplify right side
   6,131.61x = 43,840,770.20
5. Step 5: Solve for x
   x = 43,840,770.20/6,131.61
6. Step 6: Final answer
   x = 7,149.96