Finding the Fourth Proportional to 1,434.90, 1,980.18 and 845.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.90 : 1,980.18 = 845.40 : x
2. Step 2: Convert to fraction form
   1,434.90/1,980.18 = 845.40/x
3. Step 3: Cross multiply
   1,434.90x = 1,980.18 × 845.40
4. Step 4: Simplify right side
   1,434.90x = 1,674,044.17
5. Step 5: Solve for x
   x = 1,674,044.17/1,434.90
6. Step 6: Final answer
   x = 1,166.66