Finding the Fourth Proportional to 12,894.67, 19,339.86 and 4,128.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,894.67 : 19,339.86 = 4,128.45 : x
2. Step 2: Convert to fraction form
   12,894.67/19,339.86 = 4,128.45/x
3. Step 3: Cross multiply
   12,894.67x = 19,339.86 × 4,128.45
4. Step 4: Simplify right side
   12,894.67x = 79,843,645.02
5. Step 5: Solve for x
   x = 79,843,645.02/12,894.67
6. Step 6: Final answer
   x = 6,191.99