Finding the Fourth Proportional to 8,978.46, 13,474.17 and 5,090.46

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.46 : 13,474.17 = 5,090.46 : x
2. Step 2: Convert to fraction form
   8,978.46/13,474.17 = 5,090.46/x
3. Step 3: Cross multiply
   8,978.46x = 13,474.17 × 5,090.46
4. Step 4: Simplify right side
   8,978.46x = 68,589,723.42
5. Step 5: Solve for x
   x = 68,589,723.42/8,978.46
6. Step 6: Final answer
   x = 7,639.36