Finding the Fourth Proportional to 9,870.05, 13,620.62 and 5,394.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.05 : 13,620.62 = 5,394.06 : x
2. Step 2: Convert to fraction form
   9,870.05/13,620.62 = 5,394.06/x
3. Step 3: Cross multiply
   9,870.05x = 13,620.62 × 5,394.06
4. Step 4: Simplify right side
   9,870.05x = 73,470,455.00
5. Step 5: Solve for x
   x = 73,470,455.00/9,870.05
6. Step 6: Final answer
   x = 7,443.78