Finding the Fourth Proportional to 1,914.21, 2,642.10 and 1,128.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.21 : 2,642.10 = 1,128.51 : x
2. Step 2: Convert to fraction form
   1,914.21/2,642.10 = 1,128.51/x
3. Step 3: Cross multiply
   1,914.21x = 2,642.10 × 1,128.51
4. Step 4: Simplify right side
   1,914.21x = 2,981,636.27
5. Step 5: Solve for x
   x = 2,981,636.27/1,914.21
6. Step 6: Final answer
   x = 1,557.63