Finding the Fourth Proportional to 2,359.86, 3,538.24 and 1,321.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,359.86 : 3,538.24 = 1,321.40 : x
2. Step 2: Convert to fraction form
   2,359.86/3,538.24 = 1,321.40/x
3. Step 3: Cross multiply
   2,359.86x = 3,538.24 × 1,321.40
4. Step 4: Simplify right side
   2,359.86x = 4,675,409.34
5. Step 5: Solve for x
   x = 4,675,409.34/2,359.86
6. Step 6: Final answer
   x = 1,981.22