Finding the Fourth Proportional to 2,130.72, 3,191.40 and 1,718.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,130.72 : 3,191.40 = 1,718.88 : x
2. Step 2: Convert to fraction form
   2,130.72/3,191.40 = 1,718.88/x
3. Step 3: Cross multiply
   2,130.72x = 3,191.40 × 1,718.88
4. Step 4: Simplify right side
   2,130.72x = 5,485,633.63
5. Step 5: Solve for x
   x = 5,485,633.63/2,130.72
6. Step 6: Final answer
   x = 2,574.54