Finding the Fourth Proportional to 1,009.89, 1,393.38 and 632.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.89 : 1,393.38 = 632.10 : x
2. Step 2: Convert to fraction form
   1,009.89/1,393.38 = 632.10/x
3. Step 3: Cross multiply
   1,009.89x = 1,393.38 × 632.10
4. Step 4: Simplify right side
   1,009.89x = 880,758.95
5. Step 5: Solve for x
   x = 880,758.95/1,009.89
6. Step 6: Final answer
   x = 872.13