Finding the Fourth Proportional to 11,310.88, 16,978.73 and 8,985.83

Step by Step Solution

1. Step 1: Write the proportion equation
   11,310.88 : 16,978.73 = 8,985.83 : x
2. Step 2: Convert to fraction form
   11,310.88/16,978.73 = 8,985.83/x
3. Step 3: Cross multiply
   11,310.88x = 16,978.73 × 8,985.83
4. Step 4: Simplify right side
   11,310.88x = 152,567,902.12
5. Step 5: Solve for x
   x = 152,567,902.12/11,310.88
6. Step 6: Final answer
   x = 13,488.60