Finding the Fourth Proportional to 9,991.69, 14,989.86 and 3,417.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.69 : 14,989.86 = 3,417.89 : x
2. Step 2: Convert to fraction form
   9,991.69/14,989.86 = 3,417.89/x
3. Step 3: Cross multiply
   9,991.69x = 14,989.86 × 3,417.89
4. Step 4: Simplify right side
   9,991.69x = 51,233,617.65
5. Step 5: Solve for x
   x = 51,233,617.65/9,991.69
6. Step 6: Final answer
   x = 5,127.62