Finding the Fourth Proportional to 1,978.41, 2,969.91 and 1,157.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.41 : 2,969.91 = 1,157.28 : x
2. Step 2: Convert to fraction form
   1,978.41/2,969.91 = 1,157.28/x
3. Step 3: Cross multiply
   1,978.41x = 2,969.91 × 1,157.28
4. Step 4: Simplify right side
   1,978.41x = 3,437,017.44
5. Step 5: Solve for x
   x = 3,437,017.44/1,978.41
6. Step 6: Final answer
   x = 1,737.26