Finding the Fourth Proportional to 9,918.63, 13,688.24 and 5,728.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.63 : 13,688.24 = 5,728.23 : x
2. Step 2: Convert to fraction form
   9,918.63/13,688.24 = 5,728.23/x
3. Step 3: Cross multiply
   9,918.63x = 13,688.24 × 5,728.23
4. Step 4: Simplify right side
   9,918.63x = 78,409,387.02
5. Step 5: Solve for x
   x = 78,409,387.02/9,918.63
6. Step 6: Final answer
   x = 7,905.26