Finding the Fourth Proportional to 8,390.16, 12,583.38 and 5,091.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,390.16 : 12,583.38 = 5,091.42 : x
2. Step 2: Convert to fraction form
   8,390.16/12,583.38 = 5,091.42/x
3. Step 3: Cross multiply
   8,390.16x = 12,583.38 × 5,091.42
4. Step 4: Simplify right side
   8,390.16x = 64,067,272.60
5. Step 5: Solve for x
   x = 64,067,272.60/8,390.16
6. Step 6: Final answer
   x = 7,636.00