Finding the Fourth Proportional to 11,887.20, 17,837.28 and 7,506.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,887.20 : 17,837.28 = 7,506.72 : x
2. Step 2: Convert to fraction form
   11,887.20/17,837.28 = 7,506.72/x
3. Step 3: Cross multiply
   11,887.20x = 17,837.28 × 7,506.72
4. Step 4: Simplify right side
   11,887.20x = 133,899,466.52
5. Step 5: Solve for x
   x = 133,899,466.52/11,887.20
6. Step 6: Final answer
   x = 11,264.17