Finding the Fourth Proportional to 1,335.25, 1,841.22 and 916.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.25 : 1,841.22 = 916.21 : x
2. Step 2: Convert to fraction form
   1,335.25/1,841.22 = 916.21/x
3. Step 3: Cross multiply
   1,335.25x = 1,841.22 × 916.21
4. Step 4: Simplify right side
   1,335.25x = 1,686,941.86
5. Step 5: Solve for x
   x = 1,686,941.86/1,335.25
6. Step 6: Final answer
   x = 1,263.40