Finding the Fourth Proportional to 13,015.78, 19,521.32 and 3,653.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,015.78 : 19,521.32 = 3,653.50 : x
2. Step 2: Convert to fraction form
   13,015.78/19,521.32 = 3,653.50/x
3. Step 3: Cross multiply
   13,015.78x = 19,521.32 × 3,653.50
4. Step 4: Simplify right side
   13,015.78x = 71,321,075.55
5. Step 5: Solve for x
   x = 71,321,075.55/13,015.78
6. Step 6: Final answer
   x = 5,479.59