Finding the Fourth Proportional to 2,129.12, 3,190.76 and 1,086.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.12 : 3,190.76 = 1,086.93 : x
2. Step 2: Convert to fraction form
   2,129.12/3,190.76 = 1,086.93/x
3. Step 3: Cross multiply
   2,129.12x = 3,190.76 × 1,086.93
4. Step 4: Simplify right side
   2,129.12x = 3,468,131.41
5. Step 5: Solve for x
   x = 3,468,131.41/2,129.12
6. Step 6: Final answer
   x = 1,628.90