Finding the Fourth Proportional to 13,128.42, 19,689.43 and 3,766.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,128.42 : 19,689.43 = 3,766.24 : x
2. Step 2: Convert to fraction form
   13,128.42/19,689.43 = 3,766.24/x
3. Step 3: Cross multiply
   13,128.42x = 19,689.43 × 3,766.24
4. Step 4: Simplify right side
   13,128.42x = 74,155,001.56
5. Step 5: Solve for x
   x = 74,155,001.56/13,128.42
6. Step 6: Final answer
   x = 5,648.43