Finding the Fourth Proportional to 9,912.61, 13,679.27 and 5,436.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,912.61 : 13,679.27 = 5,436.35 : x
2. Step 2: Convert to fraction form
   9,912.61/13,679.27 = 5,436.35/x
3. Step 3: Cross multiply
   9,912.61x = 13,679.27 × 5,436.35
4. Step 4: Simplify right side
   9,912.61x = 74,365,231.07
5. Step 5: Solve for x
   x = 74,365,231.07/9,912.61
6. Step 6: Final answer
   x = 7,502.09