Finding the Fourth Proportional to 9,870.84, 13,622.67 and 5,622.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.84 : 13,622.67 = 5,622.09 : x
2. Step 2: Convert to fraction form
   9,870.84/13,622.67 = 5,622.09/x
3. Step 3: Cross multiply
   9,870.84x = 13,622.67 × 5,622.09
4. Step 4: Simplify right side
   9,870.84x = 76,587,876.78
5. Step 5: Solve for x
   x = 76,587,876.78/9,870.84
6. Step 6: Final answer
   x = 7,759.00