Finding the Fourth Proportional to 3,902.50, 5,385.78 and 2,223.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,902.50 : 5,385.78 = 2,223.98 : x
2. Step 2: Convert to fraction form
   3,902.50/5,385.78 = 2,223.98/x
3. Step 3: Cross multiply
   3,902.50x = 5,385.78 × 2,223.98
4. Step 4: Simplify right side
   3,902.50x = 11,977,867.00
5. Step 5: Solve for x
   x = 11,977,867.00/3,902.50
6. Step 6: Final answer
   x = 3,069.28