Finding the Fourth Proportional to 9,912.63, 13,679.78 and 5,436.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,912.63 : 13,679.78 = 5,436.39 : x
2. Step 2: Convert to fraction form
   9,912.63/13,679.78 = 5,436.39/x
3. Step 3: Cross multiply
   9,912.63x = 13,679.78 × 5,436.39
4. Step 4: Simplify right side
   9,912.63x = 74,368,592.01
5. Step 5: Solve for x
   x = 74,368,592.01/9,912.63
6. Step 6: Final answer
   x = 7,502.41