Finding the Fourth Proportional to 1,357.86, 1,870.65 and 1,120.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.86 : 1,870.65 = 1,120.26 : x
2. Step 2: Convert to fraction form
   1,357.86/1,870.65 = 1,120.26/x
3. Step 3: Cross multiply
   1,357.86x = 1,870.65 × 1,120.26
4. Step 4: Simplify right side
   1,357.86x = 2,095,614.37
5. Step 5: Solve for x
   x = 2,095,614.37/1,357.86
6. Step 6: Final answer
   x = 1,543.32