Finding the Fourth Proportional to 13,200.82, 19,808.67 and 5,415.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.82 : 19,808.67 = 5,415.10 : x
2. Step 2: Convert to fraction form
   13,200.82/19,808.67 = 5,415.10/x
3. Step 3: Cross multiply
   13,200.82x = 19,808.67 × 5,415.10
4. Step 4: Simplify right side
   13,200.82x = 107,265,928.92
5. Step 5: Solve for x
   x = 107,265,928.92/13,200.82
6. Step 6: Final answer
   x = 8,125.70