Finding the Fourth Proportional to 1,381.54, 1,898.60 and 1,317.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.54 : 1,898.60 = 1,317.30 : x
2. Step 2: Convert to fraction form
   1,381.54/1,898.60 = 1,317.30/x
3. Step 3: Cross multiply
   1,381.54x = 1,898.60 × 1,317.30
4. Step 4: Simplify right side
   1,381.54x = 2,501,025.78
5. Step 5: Solve for x
   x = 2,501,025.78/1,381.54
6. Step 6: Final answer
   x = 1,810.32