Finding the Fourth Proportional to 9,918.91, 13,688.98 and 5,443.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.91 : 13,688.98 = 5,443.53 : x
2. Step 2: Convert to fraction form
   9,918.91/13,688.98 = 5,443.53/x
3. Step 3: Cross multiply
   9,918.91x = 13,688.98 × 5,443.53
4. Step 4: Simplify right side
   9,918.91x = 74,516,373.30
5. Step 5: Solve for x
   x = 74,516,373.30/9,918.91
6. Step 6: Final answer
   x = 7,512.56