Finding the Fourth Proportional to 9,404.52, 12,978.66 and 5,212.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.52 : 12,978.66 = 5,212.76 : x
2. Step 2: Convert to fraction form
   9,404.52/12,978.66 = 5,212.76/x
3. Step 3: Cross multiply
   9,404.52x = 12,978.66 × 5,212.76
4. Step 4: Simplify right side
   9,404.52x = 67,654,639.70
5. Step 5: Solve for x
   x = 67,654,639.70/9,404.52
6. Step 6: Final answer
   x = 7,193.84