Finding the Fourth Proportional to 1,767.80, 2,655.78 and 1,111.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,767.80 : 2,655.78 = 1,111.72 : x
2. Step 2: Convert to fraction form
   1,767.80/2,655.78 = 1,111.72/x
3. Step 3: Cross multiply
   1,767.80x = 2,655.78 × 1,111.72
4. Step 4: Simplify right side
   1,767.80x = 2,952,483.74
5. Step 5: Solve for x
   x = 2,952,483.74/1,767.80
6. Step 6: Final answer
   x = 1,670.15