Finding the Fourth Proportional to 13,091.49, 19,637.37 and 7,260.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.49 : 19,637.37 = 7,260.57 : x
2. Step 2: Convert to fraction form
   13,091.49/19,637.37 = 7,260.57/x
3. Step 3: Cross multiply
   13,091.49x = 19,637.37 × 7,260.57
4. Step 4: Simplify right side
   13,091.49x = 142,578,499.50
5. Step 5: Solve for x
   x = 142,578,499.50/13,091.49
6. Step 6: Final answer
   x = 10,890.93