Finding the Fourth Proportional to 2,154.39, 2,973.38 and 1,315.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,154.39 : 2,973.38 = 1,315.58 : x
2. Step 2: Convert to fraction form
   2,154.39/2,973.38 = 1,315.58/x
3. Step 3: Cross multiply
   2,154.39x = 2,973.38 × 1,315.58
4. Step 4: Simplify right side
   2,154.39x = 3,911,697.82
5. Step 5: Solve for x
   x = 3,911,697.82/2,154.39
6. Step 6: Final answer
   x = 1,815.69