Finding the Fourth Proportional to 1,870.78, 2,804.04 and 1,138.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.78 : 2,804.04 = 1,138.74 : x
2. Step 2: Convert to fraction form
   1,870.78/2,804.04 = 1,138.74/x
3. Step 3: Cross multiply
   1,870.78x = 2,804.04 × 1,138.74
4. Step 4: Simplify right side
   1,870.78x = 3,193,072.51
5. Step 5: Solve for x
   x = 3,193,072.51/1,870.78
6. Step 6: Final answer
   x = 1,706.81