Finding the Fourth Proportional to 9,191.07, 12,686.28 and 5,416.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,191.07 : 12,686.28 = 5,416.42 : x
2. Step 2: Convert to fraction form
   9,191.07/12,686.28 = 5,416.42/x
3. Step 3: Cross multiply
   9,191.07x = 12,686.28 × 5,416.42
4. Step 4: Simplify right side
   9,191.07x = 68,714,220.72
5. Step 5: Solve for x
   x = 68,714,220.72/9,191.07
6. Step 6: Final answer
   x = 7,476.19