Finding the Fourth Proportional to 13,285.40, 19,930.72 and 3,925.58

Step by Step Solution

1. Step 1: Write the proportion equation
   13,285.40 : 19,930.72 = 3,925.58 : x
2. Step 2: Convert to fraction form
   13,285.40/19,930.72 = 3,925.58/x
3. Step 3: Cross multiply
   13,285.40x = 19,930.72 × 3,925.58
4. Step 4: Simplify right side
   13,285.40x = 78,239,635.82
5. Step 5: Solve for x
   x = 78,239,635.82/13,285.40
6. Step 6: Final answer
   x = 5,889.14