Finding the Fourth Proportional to 11,312.31, 16,974.12 and 5,076.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,312.31 : 16,974.12 = 5,076.78 : x
2. Step 2: Convert to fraction form
   11,312.31/16,974.12 = 5,076.78/x
3. Step 3: Cross multiply
   11,312.31x = 16,974.12 × 5,076.78
4. Step 4: Simplify right side
   11,312.31x = 86,173,872.93
5. Step 5: Solve for x
   x = 86,173,872.93/11,312.31
6. Step 6: Final answer
   x = 7,617.71