Finding the Fourth Proportional to 12,865.56, 19,298.12 and 3,505.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,865.56 : 19,298.12 = 3,505.43 : x
2. Step 2: Convert to fraction form
   12,865.56/19,298.12 = 3,505.43/x
3. Step 3: Cross multiply
   12,865.56x = 19,298.12 × 3,505.43
4. Step 4: Simplify right side
   12,865.56x = 67,648,094.77
5. Step 5: Solve for x
   x = 67,648,094.77/12,865.56
6. Step 6: Final answer
   x = 5,258.08