Finding the Fourth Proportional to 9,865.79, 13,614.56 and 5,389.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,865.79 : 13,614.56 = 5,389.56 : x
2. Step 2: Convert to fraction form
   9,865.79/13,614.56 = 5,389.56/x
3. Step 3: Cross multiply
   9,865.79x = 13,614.56 × 5,389.56
4. Step 4: Simplify right side
   9,865.79x = 73,376,406.45
5. Step 5: Solve for x
   x = 73,376,406.45/9,865.79
6. Step 6: Final answer
   x = 7,437.46