Finding the Fourth Proportional to 1,356.80, 1,873.25 and 1,108.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.80 : 1,873.25 = 1,108.72 : x
2. Step 2: Convert to fraction form
   1,356.80/1,873.25 = 1,108.72/x
3. Step 3: Cross multiply
   1,356.80x = 1,873.25 × 1,108.72
4. Step 4: Simplify right side
   1,356.80x = 2,076,909.74
5. Step 5: Solve for x
   x = 2,076,909.74/1,356.80
6. Step 6: Final answer
   x = 1,530.74