Finding the Fourth Proportional to 9,870.11, 13,620.53 and 5,393.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.11 : 13,620.53 = 5,393.88 : x
2. Step 2: Convert to fraction form
   9,870.11/13,620.53 = 5,393.88/x
3. Step 3: Cross multiply
   9,870.11x = 13,620.53 × 5,393.88
4. Step 4: Simplify right side
   9,870.11x = 73,467,504.36
5. Step 5: Solve for x
   x = 73,467,504.36/9,870.11
6. Step 6: Final answer
   x = 7,443.43