Finding the Fourth Proportional to 13,610.72, 18,784.17 and 7,642.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,610.72 : 18,784.17 = 7,642.04 : x
2. Step 2: Convert to fraction form
   13,610.72/18,784.17 = 7,642.04/x
3. Step 3: Cross multiply
   13,610.72x = 18,784.17 × 7,642.04
4. Step 4: Simplify right side
   13,610.72x = 143,549,284.59
5. Step 5: Solve for x
   x = 143,549,284.59/13,610.72
6. Step 6: Final answer
   x = 10,546.78