Finding the Fourth Proportional to 3,926.89, 5,887.59 and 1,978.03

Step by Step Solution

1. Step 1: Write the proportion equation
   3,926.89 : 5,887.59 = 1,978.03 : x
2. Step 2: Convert to fraction form
   3,926.89/5,887.59 = 1,978.03/x
3. Step 3: Cross multiply
   3,926.89x = 5,887.59 × 1,978.03
4. Step 4: Simplify right side
   3,926.89x = 11,645,829.65
5. Step 5: Solve for x
   x = 11,645,829.65/3,926.89
6. Step 6: Final answer
   x = 2,965.66