Finding the Fourth Proportional to 1,404.21, 2,105.10 and 1,200.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.21 : 2,105.10 = 1,200.09 : x
2. Step 2: Convert to fraction form
   1,404.21/2,105.10 = 1,200.09/x
3. Step 3: Cross multiply
   1,404.21x = 2,105.10 × 1,200.09
4. Step 4: Simplify right side
   1,404.21x = 2,526,309.46
5. Step 5: Solve for x
   x = 2,526,309.46/1,404.21
6. Step 6: Final answer
   x = 1,799.10