Finding the Fourth Proportional to 3,509.98, 5,290.01 and 3,509.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,509.98 : 5,290.01 = 3,509.98 : x
2. Step 2: Convert to fraction form
   3,509.98/5,290.01 = 3,509.98/x
3. Step 3: Cross multiply
   3,509.98x = 5,290.01 × 3,509.98
4. Step 4: Simplify right side
   3,509.98x = 18,567,829.30
5. Step 5: Solve for x
   x = 18,567,829.30/3,509.98
6. Step 6: Final answer
   x = 5,290.01