Finding the Fourth Proportional to 1,091.82, 1,635.57 and 515.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.82 : 1,635.57 = 515.10 : x
2. Step 2: Convert to fraction form
   1,091.82/1,635.57 = 515.10/x
3. Step 3: Cross multiply
   1,091.82x = 1,635.57 × 515.10
4. Step 4: Simplify right side
   1,091.82x = 842,482.11
5. Step 5: Solve for x
   x = 842,482.11/1,091.82
6. Step 6: Final answer
   x = 771.63