Finding the Fourth Proportional to 2,070.78, 3,106.32 and 683.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.78 : 3,106.32 = 683.76 : x
2. Step 2: Convert to fraction form
   2,070.78/3,106.32 = 683.76/x
3. Step 3: Cross multiply
   2,070.78x = 3,106.32 × 683.76
4. Step 4: Simplify right side
   2,070.78x = 2,123,977.36
5. Step 5: Solve for x
   x = 2,123,977.36/2,070.78
6. Step 6: Final answer
   x = 1,025.69