Finding the Fourth Proportional to 9,171.55, 12,656.78 and 5,394.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,171.55 : 12,656.78 = 5,394.87 : x
2. Step 2: Convert to fraction form
   9,171.55/12,656.78 = 5,394.87/x
3. Step 3: Cross multiply
   9,171.55x = 12,656.78 × 5,394.87
4. Step 4: Simplify right side
   9,171.55x = 68,281,682.72
5. Step 5: Solve for x
   x = 68,281,682.72/9,171.55
6. Step 6: Final answer
   x = 7,444.94