Finding the Fourth Proportional to 9,789.18, 13,499.13 and 8,377.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,789.18 : 13,499.13 = 8,377.57 : x
2. Step 2: Convert to fraction form
   9,789.18/13,499.13 = 8,377.57/x
3. Step 3: Cross multiply
   9,789.18x = 13,499.13 × 8,377.57
4. Step 4: Simplify right side
   9,789.18x = 113,089,906.51
5. Step 5: Solve for x
   x = 113,089,906.51/9,789.18
6. Step 6: Final answer
   x = 11,552.54