Finding the Fourth Proportional to 9,355.98, 12,912.06 and 5,378.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,355.98 : 12,912.06 = 5,378.52 : x
2. Step 2: Convert to fraction form
   9,355.98/12,912.06 = 5,378.52/x
3. Step 3: Cross multiply
   9,355.98x = 12,912.06 × 5,378.52
4. Step 4: Simplify right side
   9,355.98x = 69,447,772.95
5. Step 5: Solve for x
   x = 69,447,772.95/9,355.98
6. Step 6: Final answer
   x = 7,422.82