Finding the Fourth Proportional to 9,621.94, 13,278.34 and 5,643.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.94 : 13,278.34 = 5,643.12 : x
2. Step 2: Convert to fraction form
   9,621.94/13,278.34 = 5,643.12/x
3. Step 3: Cross multiply
   9,621.94x = 13,278.34 × 5,643.12
4. Step 4: Simplify right side
   9,621.94x = 74,931,266.02
5. Step 5: Solve for x
   x = 74,931,266.02/9,621.94
6. Step 6: Final answer
   x = 7,787.54