Finding the Fourth Proportional to 10,991.89, 16,456.74 and 9,953.83

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.89 : 16,456.74 = 9,953.83 : x
2. Step 2: Convert to fraction form
   10,991.89/16,456.74 = 9,953.83/x
3. Step 3: Cross multiply
   10,991.89x = 16,456.74 × 9,953.83
4. Step 4: Simplify right side
   10,991.89x = 163,807,592.31
5. Step 5: Solve for x
   x = 163,807,592.31/10,991.89
6. Step 6: Final answer
   x = 14,902.59