Finding the Fourth Proportional to 2,478.73, 3,420.69 and 1,359.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.73 : 3,420.69 = 1,359.60 : x
2. Step 2: Convert to fraction form
   2,478.73/3,420.69 = 1,359.60/x
3. Step 3: Cross multiply
   2,478.73x = 3,420.69 × 1,359.60
4. Step 4: Simplify right side
   2,478.73x = 4,650,746.22
5. Step 5: Solve for x
   x = 4,650,746.22/2,478.73
6. Step 6: Final answer
   x = 1,876.27