Finding the Fourth Proportional to 1,357.91, 1,871.73 and 1,108.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.91 : 1,871.73 = 1,108.79 : x
2. Step 2: Convert to fraction form
   1,357.91/1,871.73 = 1,108.79/x
3. Step 3: Cross multiply
   1,357.91x = 1,871.73 × 1,108.79
4. Step 4: Simplify right side
   1,357.91x = 2,075,346.15
5. Step 5: Solve for x
   x = 2,075,346.15/1,357.91
6. Step 6: Final answer
   x = 1,528.34