Finding the Fourth Proportional to 2,870.96, 4,305.87 and 790.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.96 : 4,305.87 = 790.43 : x
2. Step 2: Convert to fraction form
   2,870.96/4,305.87 = 790.43/x
3. Step 3: Cross multiply
   2,870.96x = 4,305.87 × 790.43
4. Step 4: Simplify right side
   2,870.96x = 3,403,488.82
5. Step 5: Solve for x
   x = 3,403,488.82/2,870.96
6. Step 6: Final answer
   x = 1,185.49