Finding the Fourth Proportional to 2,128.77, 2,936.87 and 1,570.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.77 : 2,936.87 = 1,570.59 : x
2. Step 2: Convert to fraction form
   2,128.77/2,936.87 = 1,570.59/x
3. Step 3: Cross multiply
   2,128.77x = 2,936.87 × 1,570.59
4. Step 4: Simplify right side
   2,128.77x = 4,612,596.12
5. Step 5: Solve for x
   x = 4,612,596.12/2,128.77
6. Step 6: Final answer
   x = 2,166.79