Finding the Fourth Proportional to 1,997.58, 2,978.78 and 1,859.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,997.58 : 2,978.78 = 1,859.08 : x
2. Step 2: Convert to fraction form
   1,997.58/2,978.78 = 1,859.08/x
3. Step 3: Cross multiply
   1,997.58x = 2,978.78 × 1,859.08
4. Step 4: Simplify right side
   1,997.58x = 5,537,790.32
5. Step 5: Solve for x
   x = 5,537,790.32/1,997.58
6. Step 6: Final answer
   x = 2,772.25