Finding the Fourth Proportional to 2,478.77, 3,420.71 and 1,359.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.77 : 3,420.71 = 1,359.69 : x
2. Step 2: Convert to fraction form
   2,478.77/3,420.71 = 1,359.69/x
3. Step 3: Cross multiply
   2,478.77x = 3,420.71 × 1,359.69
4. Step 4: Simplify right side
   2,478.77x = 4,651,098.38
5. Step 5: Solve for x
   x = 4,651,098.38/2,478.77
6. Step 6: Final answer
   x = 1,876.38