Finding the Fourth Proportional to 2,780.90, 4,168.17 and 1,317.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.90 : 4,168.17 = 1,317.98 : x
2. Step 2: Convert to fraction form
   2,780.90/4,168.17 = 1,317.98/x
3. Step 3: Cross multiply
   2,780.90x = 4,168.17 × 1,317.98
4. Step 4: Simplify right side
   2,780.90x = 5,493,564.70
5. Step 5: Solve for x
   x = 5,493,564.70/2,780.90
6. Step 6: Final answer
   x = 1,975.46