Finding the Fourth Proportional to 1,506.78, 2,261.52 and 891.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,506.78 : 2,261.52 = 891.05 : x
2. Step 2: Convert to fraction form
   1,506.78/2,261.52 = 891.05/x
3. Step 3: Cross multiply
   1,506.78x = 2,261.52 × 891.05
4. Step 4: Simplify right side
   1,506.78x = 2,015,116.09
5. Step 5: Solve for x
   x = 2,015,116.09/1,506.78
6. Step 6: Final answer
   x = 1,337.37