Finding the Fourth Proportional to 2,780.16, 4,167.42 and 1,316.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.16 : 4,167.42 = 1,316.70 : x
2. Step 2: Convert to fraction form
   2,780.16/4,167.42 = 1,316.70/x
3. Step 3: Cross multiply
   2,780.16x = 4,167.42 × 1,316.70
4. Step 4: Simplify right side
   2,780.16x = 5,487,241.91
5. Step 5: Solve for x
   x = 5,487,241.91/2,780.16
6. Step 6: Final answer
   x = 1,973.71