Finding the Fourth Proportional to 1,436.17, 1,981.88 and 806.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.17 : 1,981.88 = 806.70 : x
2. Step 2: Convert to fraction form
   1,436.17/1,981.88 = 806.70/x
3. Step 3: Cross multiply
   1,436.17x = 1,981.88 × 806.70
4. Step 4: Simplify right side
   1,436.17x = 1,598,779.66
5. Step 5: Solve for x
   x = 1,598,779.66/1,436.17
6. Step 6: Final answer
   x = 1,113.23