Finding the Fourth Proportional to 1,542.09, 2,128.78 and 1,071.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.09 : 2,128.78 = 1,071.58 : x
2. Step 2: Convert to fraction form
   1,542.09/2,128.78 = 1,071.58/x
3. Step 3: Cross multiply
   1,542.09x = 2,128.78 × 1,071.58
4. Step 4: Simplify right side
   1,542.09x = 2,281,147.43
5. Step 5: Solve for x
   x = 2,281,147.43/1,542.09
6. Step 6: Final answer
   x = 1,479.26