Finding the Fourth Proportional to 1,435.30, 1,980.78 and 845.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.30 : 1,980.78 = 845.76 : x
2. Step 2: Convert to fraction form
   1,435.30/1,980.78 = 845.76/x
3. Step 3: Cross multiply
   1,435.30x = 1,980.78 × 845.76
4. Step 4: Simplify right side
   1,435.30x = 1,675,264.49
5. Step 5: Solve for x
   x = 1,675,264.49/1,435.30
6. Step 6: Final answer
   x = 1,167.19