Finding the Fourth Proportional to 11,840.39, 17,760.61 and 3,520.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,840.39 : 17,760.61 = 3,520.50 : x
2. Step 2: Convert to fraction form
   11,840.39/17,760.61 = 3,520.50/x
3. Step 3: Cross multiply
   11,840.39x = 17,760.61 × 3,520.50
4. Step 4: Simplify right side
   11,840.39x = 62,526,165.30
5. Step 5: Solve for x
   x = 62,526,165.30/11,840.39
6. Step 6: Final answer
   x = 5,280.75