Finding the Fourth Proportional to 11,156.91, 15,399.98 and 7,178.03

Step by Step Solution

1. Step 1: Write the proportion equation
   11,156.91 : 15,399.98 = 7,178.03 : x
2. Step 2: Convert to fraction form
   11,156.91/15,399.98 = 7,178.03/x
3. Step 3: Cross multiply
   11,156.91x = 15,399.98 × 7,178.03
4. Step 4: Simplify right side
   11,156.91x = 110,541,518.44
5. Step 5: Solve for x
   x = 110,541,518.44/11,156.91
6. Step 6: Final answer
   x = 9,907.90