Finding the Fourth Proportional to 11,156.58, 15,391.85 and 7,123.57

Step by Step Solution

1. Step 1: Write the proportion equation
   11,156.58 : 15,391.85 = 7,123.57 : x
2. Step 2: Convert to fraction form
   11,156.58/15,391.85 = 7,123.57/x
3. Step 3: Cross multiply
   11,156.58x = 15,391.85 × 7,123.57
4. Step 4: Simplify right side
   11,156.58x = 109,644,846.81
5. Step 5: Solve for x
   x = 109,644,846.81/11,156.58
6. Step 6: Final answer
   x = 9,827.82