Finding the Fourth Proportional to 12,920.30, 19,383.15 and 4,156.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.30 : 19,383.15 = 4,156.10 : x
2. Step 2: Convert to fraction form
   12,920.30/19,383.15 = 4,156.10/x
3. Step 3: Cross multiply
   12,920.30x = 19,383.15 × 4,156.10
4. Step 4: Simplify right side
   12,920.30x = 80,558,309.72
5. Step 5: Solve for x
   x = 80,558,309.72/12,920.30
6. Step 6: Final answer
   x = 6,235.02