Finding the Fourth Proportional to 13,802.78, 19,047.83 and 7,515.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,802.78 : 19,047.83 = 7,515.15 : x
2. Step 2: Convert to fraction form
   13,802.78/19,047.83 = 7,515.15/x
3. Step 3: Cross multiply
   13,802.78x = 19,047.83 × 7,515.15
4. Step 4: Simplify right side
   13,802.78x = 143,147,299.62
5. Step 5: Solve for x
   x = 143,147,299.62/13,802.78
6. Step 6: Final answer
   x = 10,370.90