Finding the Fourth Proportional to 1,768.10, 2,653.49 and 891.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,768.10 : 2,653.49 = 891.47 : x
2. Step 2: Convert to fraction form
   1,768.10/2,653.49 = 891.47/x
3. Step 3: Cross multiply
   1,768.10x = 2,653.49 × 891.47
4. Step 4: Simplify right side
   1,768.10x = 2,365,515.59
5. Step 5: Solve for x
   x = 2,365,515.59/1,768.10
6. Step 6: Final answer
   x = 1,337.89