Finding the Fourth Proportional to 2,478.79, 3,420.72 and 1,359.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.79 : 3,420.72 = 1,359.70 : x
2. Step 2: Convert to fraction form
   2,478.79/3,420.72 = 1,359.70/x
3. Step 3: Cross multiply
   2,478.79x = 3,420.72 × 1,359.70
4. Step 4: Simplify right side
   2,478.79x = 4,651,152.98
5. Step 5: Solve for x
   x = 4,651,152.98/2,478.79
6. Step 6: Final answer
   x = 1,876.38