Finding the Fourth Proportional to 1,769.80, 2,658.78 and 1,113.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,769.80 : 2,658.78 = 1,113.72 : x
2. Step 2: Convert to fraction form
   1,769.80/2,658.78 = 1,113.72/x
3. Step 3: Cross multiply
   1,769.80x = 2,658.78 × 1,113.72
4. Step 4: Simplify right side
   1,769.80x = 2,961,136.46
5. Step 5: Solve for x
   x = 2,961,136.46/1,769.80
6. Step 6: Final answer
   x = 1,673.15