Finding the Fourth Proportional to 9,109.47, 13,667.46 and 3,187.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.47 : 13,667.46 = 3,187.21 : x
2. Step 2: Convert to fraction form
   9,109.47/13,667.46 = 3,187.21/x
3. Step 3: Cross multiply
   9,109.47x = 13,667.46 × 3,187.21
4. Step 4: Simplify right side
   9,109.47x = 43,561,065.19
5. Step 5: Solve for x
   x = 43,561,065.19/9,109.47
6. Step 6: Final answer
   x = 4,781.95