Finding the Fourth Proportional to 9,870.32, 13,620.64 and 5,394.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.32 : 13,620.64 = 5,394.23 : x
2. Step 2: Convert to fraction form
   9,870.32/13,620.64 = 5,394.23/x
3. Step 3: Cross multiply
   9,870.32x = 13,620.64 × 5,394.23
4. Step 4: Simplify right side
   9,870.32x = 73,472,769.83
5. Step 5: Solve for x
   x = 73,472,769.83/9,870.32
6. Step 6: Final answer
   x = 7,443.81