Finding the Fourth Proportional to 1,780.56, 2,669.52 and 842.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.56 : 2,669.52 = 842.96 : x
2. Step 2: Convert to fraction form
   1,780.56/2,669.52 = 842.96/x
3. Step 3: Cross multiply
   1,780.56x = 2,669.52 × 842.96
4. Step 4: Simplify right side
   1,780.56x = 2,250,298.58
5. Step 5: Solve for x
   x = 2,250,298.58/1,780.56
6. Step 6: Final answer
   x = 1,263.82