Finding the Fourth Proportional to 9,859.78, 13,607.13 and 5,667.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,859.78 : 13,607.13 = 5,667.94 : x
2. Step 2: Convert to fraction form
   9,859.78/13,607.13 = 5,667.94/x
3. Step 3: Cross multiply
   9,859.78x = 13,607.13 × 5,667.94
4. Step 4: Simplify right side
   9,859.78x = 77,124,396.41
5. Step 5: Solve for x
   x = 77,124,396.41/9,859.78
6. Step 6: Final answer
   x = 7,822.12