Finding the Fourth Proportional to 1,364.50, 1,880.86 and 891.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,364.50 : 1,880.86 = 891.56 : x
2. Step 2: Convert to fraction form
   1,364.50/1,880.86 = 891.56/x
3. Step 3: Cross multiply
   1,364.50x = 1,880.86 × 891.56
4. Step 4: Simplify right side
   1,364.50x = 1,676,899.54
5. Step 5: Solve for x
   x = 1,676,899.54/1,364.50
6. Step 6: Final answer
   x = 1,228.95