Finding the Fourth Proportional to 1,129.69, 1,559.00 and 632.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,129.69 : 1,559.00 = 632.31 : x
2. Step 2: Convert to fraction form
   1,129.69/1,559.00 = 632.31/x
3. Step 3: Cross multiply
   1,129.69x = 1,559.00 × 632.31
4. Step 4: Simplify right side
   1,129.69x = 985,768.13
5. Step 5: Solve for x
   x = 985,768.13/1,129.69
6. Step 6: Final answer
   x = 872.60