Finding the Fourth Proportional to 13,015.35, 17,961.41 and 7,641.63

Step by Step Solution

1. Step 1: Write the proportion equation
   13,015.35 : 17,961.41 = 7,641.63 : x
2. Step 2: Convert to fraction form
   13,015.35/17,961.41 = 7,641.63/x
3. Step 3: Cross multiply
   13,015.35x = 17,961.41 × 7,641.63
4. Step 4: Simplify right side
   13,015.35x = 137,254,449.50
5. Step 5: Solve for x
   x = 137,254,449.50/13,015.35
6. Step 6: Final answer
   x = 10,545.58