Finding the Fourth Proportional to 9,128.79, 13,689.54 and 3,866.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.79 : 13,689.54 = 3,866.22 : x
2. Step 2: Convert to fraction form
   9,128.79/13,689.54 = 3,866.22/x
3. Step 3: Cross multiply
   9,128.79x = 13,689.54 × 3,866.22
4. Step 4: Simplify right side
   9,128.79x = 52,926,773.34
5. Step 5: Solve for x
   x = 52,926,773.34/9,128.79
6. Step 6: Final answer
   x = 5,797.79