Finding the Fourth Proportional to 1,055.21, 1,456.06 and 635.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.21 : 1,456.06 = 635.55 : x
2. Step 2: Convert to fraction form
   1,055.21/1,456.06 = 635.55/x
3. Step 3: Cross multiply
   1,055.21x = 1,456.06 × 635.55
4. Step 4: Simplify right side
   1,055.21x = 925,397.34
5. Step 5: Solve for x
   x = 925,397.34/1,055.21
6. Step 6: Final answer
   x = 876.98