Finding the Fourth Proportional to 2,157.94, 2,978.37 and 1,372.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.94 : 2,978.37 = 1,372.90 : x
2. Step 2: Convert to fraction form
   2,157.94/2,978.37 = 1,372.90/x
3. Step 3: Cross multiply
   2,157.94x = 2,978.37 × 1,372.90
4. Step 4: Simplify right side
   2,157.94x = 4,089,004.17
5. Step 5: Solve for x
   x = 4,089,004.17/2,157.94
6. Step 6: Final answer
   x = 1,894.86