Finding the Fourth Proportional to 2,415.84, 3,629.52 and 1,390.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,415.84 : 3,629.52 = 1,390.56 : x
2. Step 2: Convert to fraction form
   2,415.84/3,629.52 = 1,390.56/x
3. Step 3: Cross multiply
   2,415.84x = 3,629.52 × 1,390.56
4. Step 4: Simplify right side
   2,415.84x = 5,047,065.33
5. Step 5: Solve for x
   x = 5,047,065.33/2,415.84
6. Step 6: Final answer
   x = 2,089.16