Finding the Fourth Proportional to 4,978.68, 7,469.27 and 1,858.78

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.68 : 7,469.27 = 1,858.78 : x
2. Step 2: Convert to fraction form
   4,978.68/7,469.27 = 1,858.78/x
3. Step 3: Cross multiply
   4,978.68x = 7,469.27 × 1,858.78
4. Step 4: Simplify right side
   4,978.68x = 13,883,736.70
5. Step 5: Solve for x
   x = 13,883,736.70/4,978.68
6. Step 6: Final answer
   x = 2,788.64