Finding the Fourth Proportional to 12,968.91, 17,890.88 and 8,490.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,968.91 : 17,890.88 = 8,490.69 : x
2. Step 2: Convert to fraction form
   12,968.91/17,890.88 = 8,490.69/x
3. Step 3: Cross multiply
   12,968.91x = 17,890.88 × 8,490.69
4. Step 4: Simplify right side
   12,968.91x = 151,905,873.45
5. Step 5: Solve for x
   x = 151,905,873.45/12,968.91
6. Step 6: Final answer
   x = 11,713.08