Finding the Fourth Proportional to 7,643.09, 10,542.61 and 5,521.74

Step by Step Solution

1. Step 1: Write the proportion equation
   7,643.09 : 10,542.61 = 5,521.74 : x
2. Step 2: Convert to fraction form
   7,643.09/10,542.61 = 5,521.74/x
3. Step 3: Cross multiply
   7,643.09x = 10,542.61 × 5,521.74
4. Step 4: Simplify right side
   7,643.09x = 58,213,518.71
5. Step 5: Solve for x
   x = 58,213,518.71/7,643.09
6. Step 6: Final answer
   x = 7,616.49