Finding the Fourth Proportional to 1,072.34, 1,479.79 and 630.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.34 : 1,479.79 = 630.53 : x
2. Step 2: Convert to fraction form
   1,072.34/1,479.79 = 630.53/x
3. Step 3: Cross multiply
   1,072.34x = 1,479.79 × 630.53
4. Step 4: Simplify right side
   1,072.34x = 933,061.02
5. Step 5: Solve for x
   x = 933,061.02/1,072.34
6. Step 6: Final answer
   x = 870.12