Finding the Fourth Proportional to 1,123.98, 1,551.14 and 619.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.98 : 1,551.14 = 619.86 : x
2. Step 2: Convert to fraction form
   1,123.98/1,551.14 = 619.86/x
3. Step 3: Cross multiply
   1,123.98x = 1,551.14 × 619.86
4. Step 4: Simplify right side
   1,123.98x = 961,489.64
5. Step 5: Solve for x
   x = 961,489.64/1,123.98
6. Step 6: Final answer
   x = 855.43