Finding the Fourth Proportional to 1,335.69, 1,842.90 and 916.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.69 : 1,842.90 = 916.17 : x
2. Step 2: Convert to fraction form
   1,335.69/1,842.90 = 916.17/x
3. Step 3: Cross multiply
   1,335.69x = 1,842.90 × 916.17
4. Step 4: Simplify right side
   1,335.69x = 1,688,409.69
5. Step 5: Solve for x
   x = 1,688,409.69/1,335.69
6. Step 6: Final answer
   x = 1,264.07