Finding the Fourth Proportional to 13,888.56, 19,166.22 and 7,515.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,888.56 : 19,166.22 = 7,515.15 : x
2. Step 2: Convert to fraction form
   13,888.56/19,166.22 = 7,515.15/x
3. Step 3: Cross multiply
   13,888.56x = 19,166.22 × 7,515.15
4. Step 4: Simplify right side
   13,888.56x = 144,037,018.23
5. Step 5: Solve for x
   x = 144,037,018.23/13,888.56
6. Step 6: Final answer
   x = 10,370.91