Finding the Fourth Proportional to 1,870.80, 2,804.07 and 1,407.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.80 : 2,804.07 = 1,407.12 : x
2. Step 2: Convert to fraction form
   1,870.80/2,804.07 = 1,407.12/x
3. Step 3: Cross multiply
   1,870.80x = 2,804.07 × 1,407.12
4. Step 4: Simplify right side
   1,870.80x = 3,945,665.60
5. Step 5: Solve for x
   x = 3,945,665.60/1,870.80
6. Step 6: Final answer
   x = 2,109.08