Finding the Fourth Proportional to 13,820.72, 19,066.94 and 9,631.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,820.72 : 19,066.94 = 9,631.40 : x
2. Step 2: Convert to fraction form
   13,820.72/19,066.94 = 9,631.40/x
3. Step 3: Cross multiply
   13,820.72x = 19,066.94 × 9,631.40
4. Step 4: Simplify right side
   13,820.72x = 183,641,182.42
5. Step 5: Solve for x
   x = 183,641,182.42/13,820.72
6. Step 6: Final answer
   x = 13,287.39