Finding the Fourth Proportional to 1,172.07, 1,756.89 and 624.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.07 : 1,756.89 = 624.78 : x
2. Step 2: Convert to fraction form
   1,172.07/1,756.89 = 624.78/x
3. Step 3: Cross multiply
   1,172.07x = 1,756.89 × 624.78
4. Step 4: Simplify right side
   1,172.07x = 1,097,669.73
5. Step 5: Solve for x
   x = 1,097,669.73/1,172.07
6. Step 6: Final answer
   x = 936.52