Finding the Fourth Proportional to 2,128.28, 3,188.93 and 1,304.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.28 : 3,188.93 = 1,304.81 : x
2. Step 2: Convert to fraction form
   2,128.28/3,188.93 = 1,304.81/x
3. Step 3: Cross multiply
   2,128.28x = 3,188.93 × 1,304.81
4. Step 4: Simplify right side
   2,128.28x = 4,160,925.28
5. Step 5: Solve for x
   x = 4,160,925.28/2,128.28
6. Step 6: Final answer
   x = 1,955.07