Finding the Fourth Proportional to 9,191.00, 12,686.29 and 5,415.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,191.00 : 12,686.29 = 5,415.38 : x
2. Step 2: Convert to fraction form
   9,191.00/12,686.29 = 5,415.38/x
3. Step 3: Cross multiply
   9,191.00x = 12,686.29 × 5,415.38
4. Step 4: Simplify right side
   9,191.00x = 68,701,085.68
5. Step 5: Solve for x
   x = 68,701,085.68/9,191.00
6. Step 6: Final answer
   x = 7,474.83