Finding the Fourth Proportional to 12,518.96, 18,785.34 and 5,128.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,518.96 : 18,785.34 = 5,128.58 : x
2. Step 2: Convert to fraction form
   12,518.96/18,785.34 = 5,128.58/x
3. Step 3: Cross multiply
   12,518.96x = 18,785.34 × 5,128.58
4. Step 4: Simplify right side
   12,518.96x = 96,342,165.98
5. Step 5: Solve for x
   x = 96,342,165.98/12,518.96
6. Step 6: Final answer
   x = 7,695.70