Finding the Fourth Proportional to 12,985.29, 19,479.82 and 4,097.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,985.29 : 19,479.82 = 4,097.60 : x
2. Step 2: Convert to fraction form
   12,985.29/19,479.82 = 4,097.60/x
3. Step 3: Cross multiply
   12,985.29x = 19,479.82 × 4,097.60
4. Step 4: Simplify right side
   12,985.29x = 79,820,489.94
5. Step 5: Solve for x
   x = 79,820,489.94/12,985.29
6. Step 6: Final answer
   x = 6,146.99