Finding the Fourth Proportional to 19,111.17, 28,659.47 and 9,114.15

Step by Step Solution

1. Step 1: Write the proportion equation
   19,111.17 : 28,659.47 = 9,114.15 : x
2. Step 2: Convert to fraction form
   19,111.17/28,659.47 = 9,114.15/x
3. Step 3: Cross multiply
   19,111.17x = 28,659.47 × 9,114.15
4. Step 4: Simplify right side
   19,111.17x = 261,206,770.40
5. Step 5: Solve for x
   x = 261,206,770.40/19,111.17
6. Step 6: Final answer
   x = 13,667.75