Finding the Fourth Proportional to 1,870.17, 2,579.63 and 1,171.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.17 : 2,579.63 = 1,171.55 : x
2. Step 2: Convert to fraction form
   1,870.17/2,579.63 = 1,171.55/x
3. Step 3: Cross multiply
   1,870.17x = 2,579.63 × 1,171.55
4. Step 4: Simplify right side
   1,870.17x = 3,022,146.77
5. Step 5: Solve for x
   x = 3,022,146.77/1,870.17
6. Step 6: Final answer
   x = 1,615.97