Finding the Fourth Proportional to 3,665.91, 5,499.54 and 1,200.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.91 : 5,499.54 = 1,200.87 : x
2. Step 2: Convert to fraction form
   3,665.91/5,499.54 = 1,200.87/x
3. Step 3: Cross multiply
   3,665.91x = 5,499.54 × 1,200.87
4. Step 4: Simplify right side
   3,665.91x = 6,604,232.60
5. Step 5: Solve for x
   x = 6,604,232.60/3,665.91
6. Step 6: Final answer
   x = 1,801.53