Finding the Fourth Proportional to 5,643.30, 8,431.86 and 5,643.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,643.30 : 8,431.86 = 5,643.30 : x
2. Step 2: Convert to fraction form
   5,643.30/8,431.86 = 5,643.30/x
3. Step 3: Cross multiply
   5,643.30x = 8,431.86 × 5,643.30
4. Step 4: Simplify right side
   5,643.30x = 47,583,515.54
5. Step 5: Solve for x
   x = 47,583,515.54/5,643.30
6. Step 6: Final answer
   x = 8,431.86