Finding the Fourth Proportional to 9,330.79, 12,870.71 and 5,551.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,330.79 : 12,870.71 = 5,551.40 : x
2. Step 2: Convert to fraction form
   9,330.79/12,870.71 = 5,551.40/x
3. Step 3: Cross multiply
   9,330.79x = 12,870.71 × 5,551.40
4. Step 4: Simplify right side
   9,330.79x = 71,450,431.74
5. Step 5: Solve for x
   x = 71,450,431.74/9,330.79
6. Step 6: Final answer
   x = 7,657.49