Finding the Fourth Proportional to 9,388.78, 12,955.63 and 5,611.19

Step by Step Solution

1. Step 1: Write the proportion equation
   9,388.78 : 12,955.63 = 5,611.19 : x
2. Step 2: Convert to fraction form
   9,388.78/12,955.63 = 5,611.19/x
3. Step 3: Cross multiply
   9,388.78x = 12,955.63 × 5,611.19
4. Step 4: Simplify right side
   9,388.78x = 72,696,506.09
5. Step 5: Solve for x
   x = 72,696,506.09/9,388.78
6. Step 6: Final answer
   x = 7,742.91