Finding the Fourth Proportional to 9,912.32, 13,678.89 and 5,436.11

Step by Step Solution

1. Step 1: Write the proportion equation
   9,912.32 : 13,678.89 = 5,436.11 : x
2. Step 2: Convert to fraction form
   9,912.32/13,678.89 = 5,436.11/x
3. Step 3: Cross multiply
   9,912.32x = 13,678.89 × 5,436.11
4. Step 4: Simplify right side
   9,912.32x = 74,359,882.32
5. Step 5: Solve for x
   x = 74,359,882.32/9,912.32
6. Step 6: Final answer
   x = 7,501.77