Finding the Fourth Proportional to 2,599.53, 3,900.71 and 1,213.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,599.53 : 3,900.71 = 1,213.51 : x
2. Step 2: Convert to fraction form
   2,599.53/3,900.71 = 1,213.51/x
3. Step 3: Cross multiply
   2,599.53x = 3,900.71 × 1,213.51
4. Step 4: Simplify right side
   2,599.53x = 4,733,550.59
5. Step 5: Solve for x
   x = 4,733,550.59/2,599.53
6. Step 6: Final answer
   x = 1,820.93