Finding the Fourth Proportional to 1,124.61, 1,551.90 and 620.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,124.61 : 1,551.90 = 620.54 : x
2. Step 2: Convert to fraction form
   1,124.61/1,551.90 = 620.54/x
3. Step 3: Cross multiply
   1,124.61x = 1,551.90 × 620.54
4. Step 4: Simplify right side
   1,124.61x = 963,016.03
5. Step 5: Solve for x
   x = 963,016.03/1,124.61
6. Step 6: Final answer
   x = 856.31