Finding the Fourth Proportional to 4,870.86, 7,295.76 and 2,557.50

Step by Step Solution

1. Step 1: Write the proportion equation
   4,870.86 : 7,295.76 = 2,557.50 : x
2. Step 2: Convert to fraction form
   4,870.86/7,295.76 = 2,557.50/x
3. Step 3: Cross multiply
   4,870.86x = 7,295.76 × 2,557.50
4. Step 4: Simplify right side
   4,870.86x = 18,658,906.20
5. Step 5: Solve for x
   x = 18,658,906.20/4,870.86
6. Step 6: Final answer
   x = 3,830.72