Finding the Fourth Proportional to 11,121.34, 15,345.12 and 6,404.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,121.34 : 15,345.12 = 6,404.72 : x
2. Step 2: Convert to fraction form
   11,121.34/15,345.12 = 6,404.72/x
3. Step 3: Cross multiply
   11,121.34x = 15,345.12 × 6,404.72
4. Step 4: Simplify right side
   11,121.34x = 98,281,196.97
5. Step 5: Solve for x
   x = 98,281,196.97/11,121.34
6. Step 6: Final answer
   x = 8,837.17