Finding the Fourth Proportional to 13,057.81, 19,573.30 and 5,157.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,057.81 : 19,573.30 = 5,157.12 : x
2. Step 2: Convert to fraction form
   13,057.81/19,573.30 = 5,157.12/x
3. Step 3: Cross multiply
   13,057.81x = 19,573.30 × 5,157.12
4. Step 4: Simplify right side
   13,057.81x = 100,941,856.90
5. Step 5: Solve for x
   x = 100,941,856.90/13,057.81
6. Step 6: Final answer
   x = 7,730.38