Finding the Fourth Proportional to 1,091.34, 1,635.39 and 680.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.34 : 1,635.39 = 680.94 : x
2. Step 2: Convert to fraction form
   1,091.34/1,635.39 = 680.94/x
3. Step 3: Cross multiply
   1,091.34x = 1,635.39 × 680.94
4. Step 4: Simplify right side
   1,091.34x = 1,113,602.47
5. Step 5: Solve for x
   x = 1,113,602.47/1,091.34
6. Step 6: Final answer
   x = 1,020.40