Finding the Fourth Proportional to 2,131.15, 2,940.91 and 1,199.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.15 : 2,940.91 = 1,199.47 : x
2. Step 2: Convert to fraction form
   2,131.15/2,940.91 = 1,199.47/x
3. Step 3: Cross multiply
   2,131.15x = 2,940.91 × 1,199.47
4. Step 4: Simplify right side
   2,131.15x = 3,527,533.32
5. Step 5: Solve for x
   x = 3,527,533.32/2,131.15
6. Step 6: Final answer
   x = 1,655.23