Finding the Fourth Proportional to 1,531.78, 2,114.04 and 910.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.78 : 2,114.04 = 910.78 : x
2. Step 2: Convert to fraction form
   1,531.78/2,114.04 = 910.78/x
3. Step 3: Cross multiply
   1,531.78x = 2,114.04 × 910.78
4. Step 4: Simplify right side
   1,531.78x = 1,925,425.35
5. Step 5: Solve for x
   x = 1,925,425.35/1,531.78
6. Step 6: Final answer
   x = 1,256.99