Finding the Fourth Proportional to 8,976.42, 12,390.27 and 5,393.99

Step by Step Solution

1. Step 1: Write the proportion equation
   8,976.42 : 12,390.27 = 5,393.99 : x
2. Step 2: Convert to fraction form
   8,976.42/12,390.27 = 5,393.99/x
3. Step 3: Cross multiply
   8,976.42x = 12,390.27 × 5,393.99
4. Step 4: Simplify right side
   8,976.42x = 66,833,003.23
5. Step 5: Solve for x
   x = 66,833,003.23/8,976.42
6. Step 6: Final answer
   x = 7,445.40