Finding the Fourth Proportional to 9,404.58, 12,978.84 and 5,212.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.58 : 12,978.84 = 5,212.74 : x
2. Step 2: Convert to fraction form
   9,404.58/12,978.84 = 5,212.74/x
3. Step 3: Cross multiply
   9,404.58x = 12,978.84 × 5,212.74
4. Step 4: Simplify right side
   9,404.58x = 67,655,318.42
5. Step 5: Solve for x
   x = 67,655,318.42/9,404.58
6. Step 6: Final answer
   x = 7,193.87