Finding the Fourth Proportional to 2,128.84, 3,191.77 and 1,513.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.84 : 3,191.77 = 1,513.78 : x
2. Step 2: Convert to fraction form
   2,128.84/3,191.77 = 1,513.78/x
3. Step 3: Cross multiply
   2,128.84x = 3,191.77 × 1,513.78
4. Step 4: Simplify right side
   2,128.84x = 4,831,637.59
5. Step 5: Solve for x
   x = 4,831,637.59/2,128.84
6. Step 6: Final answer
   x = 2,269.61