Finding the Fourth Proportional to 1,405.65, 2,109.83 and 1,200.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.65 : 2,109.83 = 1,200.45 : x
2. Step 2: Convert to fraction form
   1,405.65/2,109.83 = 1,200.45/x
3. Step 3: Cross multiply
   1,405.65x = 2,109.83 × 1,200.45
4. Step 4: Simplify right side
   1,405.65x = 2,532,739.42
5. Step 5: Solve for x
   x = 2,532,739.42/1,405.65
6. Step 6: Final answer
   x = 1,801.83