Finding the Fourth Proportional to 9,778.72, 13,471.82 and 7,999.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,778.72 : 13,471.82 = 7,999.96 : x
2. Step 2: Convert to fraction form
   9,778.72/13,471.82 = 7,999.96/x
3. Step 3: Cross multiply
   9,778.72x = 13,471.82 × 7,999.96
4. Step 4: Simplify right side
   9,778.72x = 107,774,021.13
5. Step 5: Solve for x
   x = 107,774,021.13/9,778.72
6. Step 6: Final answer
   x = 11,021.28