Finding the Fourth Proportional to 1,805.31, 2,491.20 and 1,059.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.31 : 2,491.20 = 1,059.30 : x
2. Step 2: Convert to fraction form
   1,805.31/2,491.20 = 1,059.30/x
3. Step 3: Cross multiply
   1,805.31x = 2,491.20 × 1,059.30
4. Step 4: Simplify right side
   1,805.31x = 2,638,928.16
5. Step 5: Solve for x
   x = 2,638,928.16/1,805.31
6. Step 6: Final answer
   x = 1,461.76