Finding the Fourth Proportional to 2,870.58, 4,303.78 and 1,309.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.58 : 4,303.78 = 1,309.74 : x
2. Step 2: Convert to fraction form
   2,870.58/4,303.78 = 1,309.74/x
3. Step 3: Cross multiply
   2,870.58x = 4,303.78 × 1,309.74
4. Step 4: Simplify right side
   2,870.58x = 5,636,832.82
5. Step 5: Solve for x
   x = 5,636,832.82/2,870.58
6. Step 6: Final answer
   x = 1,963.66