Finding the Fourth Proportional to 13,015.80, 17,961.42 and 7,350.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,015.80 : 17,961.42 = 7,350.78 : x
2. Step 2: Convert to fraction form
   13,015.80/17,961.42 = 7,350.78/x
3. Step 3: Cross multiply
   13,015.80x = 17,961.42 × 7,350.78
4. Step 4: Simplify right side
   13,015.80x = 132,030,446.91
5. Step 5: Solve for x
   x = 132,030,446.91/13,015.80
6. Step 6: Final answer
   x = 10,143.86