Finding the Fourth Proportional to 9,105.55, 12,568.28 and 5,918.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,105.55 : 12,568.28 = 5,918.91 : x
2. Step 2: Convert to fraction form
   9,105.55/12,568.28 = 5,918.91/x
3. Step 3: Cross multiply
   9,105.55x = 12,568.28 × 5,918.91
4. Step 4: Simplify right side
   9,105.55x = 74,390,518.17
5. Step 5: Solve for x
   x = 74,390,518.17/9,105.55
6. Step 6: Final answer
   x = 8,169.80