Finding the Fourth Proportional to 9,821.81, 13,554.39 and 5,345.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,821.81 : 13,554.39 = 5,345.86 : x
2. Step 2: Convert to fraction form
   9,821.81/13,554.39 = 5,345.86/x
3. Step 3: Cross multiply
   9,821.81x = 13,554.39 × 5,345.86
4. Step 4: Simplify right side
   9,821.81x = 72,459,871.33
5. Step 5: Solve for x
   x = 72,459,871.33/9,821.81
6. Step 6: Final answer
   x = 7,377.45