Finding the Fourth Proportional to 1,870.78, 2,807.12 and 1,326.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.78 : 2,807.12 = 1,326.46 : x
2. Step 2: Convert to fraction form
   1,870.78/2,807.12 = 1,326.46/x
3. Step 3: Cross multiply
   1,870.78x = 2,807.12 × 1,326.46
4. Step 4: Simplify right side
   1,870.78x = 3,723,532.40
5. Step 5: Solve for x
   x = 3,723,532.40/1,870.78
6. Step 6: Final answer
   x = 1,990.36