Finding the Fourth Proportional to 2,478.61, 3,420.50 and 1,359.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.61 : 3,420.50 = 1,359.56 : x
2. Step 2: Convert to fraction form
   2,478.61/3,420.50 = 1,359.56/x
3. Step 3: Cross multiply
   2,478.61x = 3,420.50 × 1,359.56
4. Step 4: Simplify right side
   2,478.61x = 4,650,374.98
5. Step 5: Solve for x
   x = 4,650,374.98/2,478.61
6. Step 6: Final answer
   x = 1,876.20