Finding the Fourth Proportional to 2,124.69, 3,187.20 and 1,200.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.69 : 3,187.20 = 1,200.99 : x
2. Step 2: Convert to fraction form
   2,124.69/3,187.20 = 1,200.99/x
3. Step 3: Cross multiply
   2,124.69x = 3,187.20 × 1,200.99
4. Step 4: Simplify right side
   2,124.69x = 3,827,795.33
5. Step 5: Solve for x
   x = 3,827,795.33/2,124.69
6. Step 6: Final answer
   x = 1,801.58