Finding the Fourth Proportional to 1,005.53, 1,387.94 and 632.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.53 : 1,387.94 = 632.39 : x
2. Step 2: Convert to fraction form
   1,005.53/1,387.94 = 632.39/x
3. Step 3: Cross multiply
   1,005.53x = 1,387.94 × 632.39
4. Step 4: Simplify right side
   1,005.53x = 877,709.27
5. Step 5: Solve for x
   x = 877,709.27/1,005.53
6. Step 6: Final answer
   x = 872.89