Finding the Fourth Proportional to 9,976.21, 13,767.20 and 5,499.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,976.21 : 13,767.20 = 5,499.86 : x
2. Step 2: Convert to fraction form
   9,976.21/13,767.20 = 5,499.86/x
3. Step 3: Cross multiply
   9,976.21x = 13,767.20 × 5,499.86
4. Step 4: Simplify right side
   9,976.21x = 75,717,672.59
5. Step 5: Solve for x
   x = 75,717,672.59/9,976.21
6. Step 6: Final answer
   x = 7,589.82