Finding the Fourth Proportional to 2,133, 2,943.55 and 1,188.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,133 : 2,943.55 = 1,188.72 : x
2. Step 2: Convert to fraction form
   2,133/2,943.55 = 1,188.72/x
3. Step 3: Cross multiply
   2,133x = 2,943.55 × 1,188.72
4. Step 4: Simplify right side
   2,133x = 3,499,056.76
5. Step 5: Solve for x
   x = 3,499,056.76/2,133
6. Step 6: Final answer
   x = 1,640.44