Finding the Fourth Proportional to 1,256.72, 1,878.47 and 1,090.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,256.72 : 1,878.47 = 1,090.86 : x
2. Step 2: Convert to fraction form
   1,256.72/1,878.47 = 1,090.86/x
3. Step 3: Cross multiply
   1,256.72x = 1,878.47 × 1,090.86
4. Step 4: Simplify right side
   1,256.72x = 2,049,142.33
5. Step 5: Solve for x
   x = 2,049,142.33/1,256.72
6. Step 6: Final answer
   x = 1,630.55