Finding the Fourth Proportional to 2,131.40, 3,190.70 and 1,875.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.40 : 3,190.70 = 1,875.40 : x
2. Step 2: Convert to fraction form
   2,131.40/3,190.70 = 1,875.40/x
3. Step 3: Cross multiply
   2,131.40x = 3,190.70 × 1,875.40
4. Step 4: Simplify right side
   2,131.40x = 5,983,838.78
5. Step 5: Solve for x
   x = 5,983,838.78/2,131.40
6. Step 6: Final answer
   x = 2,807.47