Finding the Fourth Proportional to 13,037.55, 17,991.72 and 7,372.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,037.55 : 17,991.72 = 7,372.31 : x
2. Step 2: Convert to fraction form
   13,037.55/17,991.72 = 7,372.31/x
3. Step 3: Cross multiply
   13,037.55x = 17,991.72 × 7,372.31
4. Step 4: Simplify right side
   13,037.55x = 132,640,447.31
5. Step 5: Solve for x
   x = 132,640,447.31/13,037.55
6. Step 6: Final answer
   x = 10,173.72