Finding the Fourth Proportional to 2,870.48, 4,305.59 and 790.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.48 : 4,305.59 = 790.70 : x
2. Step 2: Convert to fraction form
   2,870.48/4,305.59 = 790.70/x
3. Step 3: Cross multiply
   2,870.48x = 4,305.59 × 790.70
4. Step 4: Simplify right side
   2,870.48x = 3,404,430.01
5. Step 5: Solve for x
   x = 3,404,430.01/2,870.48
6. Step 6: Final answer
   x = 1,186.01