Finding the Fourth Proportional to 2,478.17, 3,420.56 and 1,692.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.17 : 3,420.56 = 1,692.07 : x
2. Step 2: Convert to fraction form
   2,478.17/3,420.56 = 1,692.07/x
3. Step 3: Cross multiply
   2,478.17x = 3,420.56 × 1,692.07
4. Step 4: Simplify right side
   2,478.17x = 5,787,826.96
5. Step 5: Solve for x
   x = 5,787,826.96/2,478.17
6. Step 6: Final answer
   x = 2,335.52