Finding the Fourth Proportional to 9,211.91, 12,712.64 and 5,435.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,211.91 : 12,712.64 = 5,435.99 : x
2. Step 2: Convert to fraction form
   9,211.91/12,712.64 = 5,435.99/x
3. Step 3: Cross multiply
   9,211.91x = 12,712.64 × 5,435.99
4. Step 4: Simplify right side
   9,211.91x = 69,105,788.52
5. Step 5: Solve for x
   x = 69,105,788.52/9,211.91
6. Step 6: Final answer
   x = 7,501.79