Finding the Fourth Proportional to 1,810.78, 2,714.04 and 770.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,810.78 : 2,714.04 = 770.47 : x
2. Step 2: Convert to fraction form
   1,810.78/2,714.04 = 770.47/x
3. Step 3: Cross multiply
   1,810.78x = 2,714.04 × 770.47
4. Step 4: Simplify right side
   1,810.78x = 2,091,086.40
5. Step 5: Solve for x
   x = 2,091,086.40/1,810.78
6. Step 6: Final answer
   x = 1,154.80