Finding the Fourth Proportional to 13,142.72, 19,717.12 and 4,377.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.72 : 19,717.12 = 4,377.72 : x
2. Step 2: Convert to fraction form
   13,142.72/19,717.12 = 4,377.72/x
3. Step 3: Cross multiply
   13,142.72x = 19,717.12 × 4,377.72
4. Step 4: Simplify right side
   13,142.72x = 86,316,030.57
5. Step 5: Solve for x
   x = 86,316,030.57/13,142.72
6. Step 6: Final answer
   x = 6,567.59