Finding the Fourth Proportional to 2,777.31, 4,166.55 and 1,315.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,777.31 : 4,166.55 = 1,315.62 : x
2. Step 2: Convert to fraction form
   2,777.31/4,166.55 = 1,315.62/x
3. Step 3: Cross multiply
   2,777.31x = 4,166.55 × 1,315.62
4. Step 4: Simplify right side
   2,777.31x = 5,481,596.51
5. Step 5: Solve for x
   x = 5,481,596.51/2,777.31
6. Step 6: Final answer
   x = 1,973.71