Finding the Fourth Proportional to 2,298.59, 3,171.50 and 1,290.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,298.59 : 3,171.50 = 1,290.08 : x
2. Step 2: Convert to fraction form
   2,298.59/3,171.50 = 1,290.08/x
3. Step 3: Cross multiply
   2,298.59x = 3,171.50 × 1,290.08
4. Step 4: Simplify right side
   2,298.59x = 4,091,484.45
5. Step 5: Solve for x
   x = 4,091,484.45/2,298.59
6. Step 6: Final answer
   x = 1,779.99