Finding the Fourth Proportional to 1,108.42, 1,529.59 and 636.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.42 : 1,529.59 = 636.34 : x
2. Step 2: Convert to fraction form
   1,108.42/1,529.59 = 636.34/x
3. Step 3: Cross multiply
   1,108.42x = 1,529.59 × 636.34
4. Step 4: Simplify right side
   1,108.42x = 973,335.17
5. Step 5: Solve for x
   x = 973,335.17/1,108.42
6. Step 6: Final answer
   x = 878.13