Finding the Fourth Proportional to 5,643.20, 7,788.53 and 5,394.04

Step by Step Solution

1. Step 1: Write the proportion equation
   5,643.20 : 7,788.53 = 5,394.04 : x
2. Step 2: Convert to fraction form
   5,643.20/7,788.53 = 5,394.04/x
3. Step 3: Cross multiply
   5,643.20x = 7,788.53 × 5,394.04
4. Step 4: Simplify right side
   5,643.20x = 42,011,636.37
5. Step 5: Solve for x
   x = 42,011,636.37/5,643.20
6. Step 6: Final answer
   x = 7,444.64