Finding the Fourth Proportional to 10,865.21, 14,994.20 and 7,090.79

Step by Step Solution

1. Step 1: Write the proportion equation
   10,865.21 : 14,994.20 = 7,090.79 : x
2. Step 2: Convert to fraction form
   10,865.21/14,994.20 = 7,090.79/x
3. Step 3: Cross multiply
   10,865.21x = 14,994.20 × 7,090.79
4. Step 4: Simplify right side
   10,865.21x = 106,320,723.42
5. Step 5: Solve for x
   x = 106,320,723.42/10,865.21
6. Step 6: Final answer
   x = 9,785.43