Finding the Fourth Proportional to 4,978.86, 7,469.45 and 1,858.88

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.86 : 7,469.45 = 1,858.88 : x
2. Step 2: Convert to fraction form
   4,978.86/7,469.45 = 1,858.88/x
3. Step 3: Cross multiply
   4,978.86x = 7,469.45 × 1,858.88
4. Step 4: Simplify right side
   4,978.86x = 13,884,811.22
5. Step 5: Solve for x
   x = 13,884,811.22/4,978.86
6. Step 6: Final answer
   x = 2,788.75