Finding the Fourth Proportional to 2,870.74, 4,305.62 and 790.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.74 : 4,305.62 = 790.28 : x
2. Step 2: Convert to fraction form
   2,870.74/4,305.62 = 790.28/x
3. Step 3: Cross multiply
   2,870.74x = 4,305.62 × 790.28
4. Step 4: Simplify right side
   2,870.74x = 3,402,641.42
5. Step 5: Solve for x
   x = 3,402,641.42/2,870.74
6. Step 6: Final answer
   x = 1,185.28