Finding the Fourth Proportional to 9,420.09, 12,970.17 and 8,000.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,420.09 : 12,970.17 = 8,000.79 : x
2. Step 2: Convert to fraction form
   9,420.09/12,970.17 = 8,000.79/x
3. Step 3: Cross multiply
   9,420.09x = 12,970.17 × 8,000.79
4. Step 4: Simplify right side
   9,420.09x = 103,771,606.43
5. Step 5: Solve for x
   x = 103,771,606.43/9,420.09
6. Step 6: Final answer
   x = 11,015.99