Finding the Fourth Proportional to 2,131.30, 3,191.55 and 1,699.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.30 : 3,191.55 = 1,699.30 : x
2. Step 2: Convert to fraction form
   2,131.30/3,191.55 = 1,699.30/x
3. Step 3: Cross multiply
   2,131.30x = 3,191.55 × 1,699.30
4. Step 4: Simplify right side
   2,131.30x = 5,423,400.92
5. Step 5: Solve for x
   x = 5,423,400.92/2,131.30
6. Step 6: Final answer
   x = 2,544.64