Finding the Fourth Proportional to 9,622.21, 13,278.72 and 5,643.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,622.21 : 13,278.72 = 5,643.40 : x
2. Step 2: Convert to fraction form
   9,622.21/13,278.72 = 5,643.40/x
3. Step 3: Cross multiply
   9,622.21x = 13,278.72 × 5,643.40
4. Step 4: Simplify right side
   9,622.21x = 74,937,128.45
5. Step 5: Solve for x
   x = 74,937,128.45/9,622.21
6. Step 6: Final answer
   x = 7,787.93