Finding the Fourth Proportional to 1,109.36, 1,530.89 and 637.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.36 : 1,530.89 = 637.25 : x
2. Step 2: Convert to fraction form
   1,109.36/1,530.89 = 637.25/x
3. Step 3: Cross multiply
   1,109.36x = 1,530.89 × 637.25
4. Step 4: Simplify right side
   1,109.36x = 975,548.81
5. Step 5: Solve for x
   x = 975,548.81/1,109.36
6. Step 6: Final answer
   x = 879.38