Finding the Fourth Proportional to 1,898.59, 2,620.30 and 1,308.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,898.59 : 2,620.30 = 1,308.10 : x
2. Step 2: Convert to fraction form
   1,898.59/2,620.30 = 1,308.10/x
3. Step 3: Cross multiply
   1,898.59x = 2,620.30 × 1,308.10
4. Step 4: Simplify right side
   1,898.59x = 3,427,611.97
5. Step 5: Solve for x
   x = 3,427,611.97/1,898.59
6. Step 6: Final answer
   x = 1,805.35