Finding the Fourth Proportional to 1,912.98, 2,870.79 and 938.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.98 : 2,870.79 = 938.55 : x
2. Step 2: Convert to fraction form
   1,912.98/2,870.79 = 938.55/x
3. Step 3: Cross multiply
   1,912.98x = 2,870.79 × 938.55
4. Step 4: Simplify right side
   1,912.98x = 2,694,392.48
5. Step 5: Solve for x
   x = 2,694,392.48/1,912.98
6. Step 6: Final answer
   x = 1,408.48