Finding the Fourth Proportional to 1,072.88, 1,480.32 and 624.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.88 : 1,480.32 = 624.69 : x
2. Step 2: Convert to fraction form
   1,072.88/1,480.32 = 624.69/x
3. Step 3: Cross multiply
   1,072.88x = 1,480.32 × 624.69
4. Step 4: Simplify right side
   1,072.88x = 924,741.10
5. Step 5: Solve for x
   x = 924,741.10/1,072.88
6. Step 6: Final answer
   x = 861.93