Finding the Fourth Proportional to 1,680.78, 2,518.90 and 755.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.78 : 2,518.90 = 755.34 : x
2. Step 2: Convert to fraction form
   1,680.78/2,518.90 = 755.34/x
3. Step 3: Cross multiply
   1,680.78x = 2,518.90 × 755.34
4. Step 4: Simplify right side
   1,680.78x = 1,902,625.93
5. Step 5: Solve for x
   x = 1,902,625.93/1,680.78
6. Step 6: Final answer
   x = 1,131.99