Finding the Fourth Proportional to 13,128.61, 19,690.23 and 3,766.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,128.61 : 19,690.23 = 3,766.12 : x
2. Step 2: Convert to fraction form
   13,128.61/19,690.23 = 3,766.12/x
3. Step 3: Cross multiply
   13,128.61x = 19,690.23 × 3,766.12
4. Step 4: Simplify right side
   13,128.61x = 74,155,769.01
5. Step 5: Solve for x
   x = 74,155,769.01/13,128.61
6. Step 6: Final answer
   x = 5,648.41