Finding the Fourth Proportional to 13,199.72, 19,792.02 and 4,429.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,199.72 : 19,792.02 = 4,429.86 : x
2. Step 2: Convert to fraction form
   13,199.72/19,792.02 = 4,429.86/x
3. Step 3: Cross multiply
   13,199.72x = 19,792.02 × 4,429.86
4. Step 4: Simplify right side
   13,199.72x = 87,675,877.72
5. Step 5: Solve for x
   x = 87,675,877.72/13,199.72
6. Step 6: Final answer
   x = 6,642.25