Finding the Fourth Proportional to 1,405.30, 1,938.99 and 845.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.30 : 1,938.99 = 845.59 : x
2. Step 2: Convert to fraction form
   1,405.30/1,938.99 = 845.59/x
3. Step 3: Cross multiply
   1,405.30x = 1,938.99 × 845.59
4. Step 4: Simplify right side
   1,405.30x = 1,639,590.55
5. Step 5: Solve for x
   x = 1,639,590.55/1,405.30
6. Step 6: Final answer
   x = 1,166.72