Finding the Fourth Proportional to 9,869.61, 13,620.24 and 5,393.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,869.61 : 13,620.24 = 5,393.55 : x
2. Step 2: Convert to fraction form
   9,869.61/13,620.24 = 5,393.55/x
3. Step 3: Cross multiply
   9,869.61x = 13,620.24 × 5,393.55
4. Step 4: Simplify right side
   9,869.61x = 73,461,445.45
5. Step 5: Solve for x
   x = 73,461,445.45/9,869.61
6. Step 6: Final answer
   x = 7,443.20