Finding the Fourth Proportional to 2,127.86, 2,935.77 and 1,288.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,127.86 : 2,935.77 = 1,288.30 : x
2. Step 2: Convert to fraction form
   2,127.86/2,935.77 = 1,288.30/x
3. Step 3: Cross multiply
   2,127.86x = 2,935.77 × 1,288.30
4. Step 4: Simplify right side
   2,127.86x = 3,782,152.49
5. Step 5: Solve for x
   x = 3,782,152.49/2,127.86
6. Step 6: Final answer
   x = 1,777.44