Finding the Fourth Proportional to 12,978.17, 19,479.56 and 8,032.85

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.17 : 19,479.56 = 8,032.85 : x
2. Step 2: Convert to fraction form
   12,978.17/19,479.56 = 8,032.85/x
3. Step 3: Cross multiply
   12,978.17x = 19,479.56 × 8,032.85
4. Step 4: Simplify right side
   12,978.17x = 156,476,245.98
5. Step 5: Solve for x
   x = 156,476,245.98/12,978.17
6. Step 6: Final answer
   x = 12,056.89