Finding the Fourth Proportional to 1,070.10, 1,605.42 and 851.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,070.10 : 1,605.42 = 851.56 : x
2. Step 2: Convert to fraction form
   1,070.10/1,605.42 = 851.56/x
3. Step 3: Cross multiply
   1,070.10x = 1,605.42 × 851.56
4. Step 4: Simplify right side
   1,070.10x = 1,367,111.46
5. Step 5: Solve for x
   x = 1,367,111.46/1,070.10
6. Step 6: Final answer
   x = 1,277.55