Finding the Fourth Proportional to 13,105.60, 19,651.68 and 3,870.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.60 : 19,651.68 = 3,870.40 : x
2. Step 2: Convert to fraction form
   13,105.60/19,651.68 = 3,870.40/x
3. Step 3: Cross multiply
   13,105.60x = 19,651.68 × 3,870.40
4. Step 4: Simplify right side
   13,105.60x = 76,059,862.27
5. Step 5: Solve for x
   x = 76,059,862.27/13,105.60
6. Step 6: Final answer
   x = 5,803.62