Finding the Fourth Proportional to 11,399.42, 17,114.88 and 7,880.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,399.42 : 17,114.88 = 7,880.78 : x
2. Step 2: Convert to fraction form
   11,399.42/17,114.88 = 7,880.78/x
3. Step 3: Cross multiply
   11,399.42x = 17,114.88 × 7,880.78
4. Step 4: Simplify right side
   11,399.42x = 134,878,604.01
5. Step 5: Solve for x
   x = 134,878,604.01/11,399.42
6. Step 6: Final answer
   x = 11,832.06