Finding the Fourth Proportional to 1,200.78, 1,801.71 and 624.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.78 : 1,801.71 = 624.06 : x
2. Step 2: Convert to fraction form
   1,200.78/1,801.71 = 624.06/x
3. Step 3: Cross multiply
   1,200.78x = 1,801.71 × 624.06
4. Step 4: Simplify right side
   1,200.78x = 1,124,375.14
5. Step 5: Solve for x
   x = 1,124,375.14/1,200.78
6. Step 6: Final answer
   x = 936.37