Finding the Fourth Proportional to 2,870.10, 4,305.42 and 1,138.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.10 : 4,305.42 = 1,138.50 : x
2. Step 2: Convert to fraction form
   2,870.10/4,305.42 = 1,138.50/x
3. Step 3: Cross multiply
   2,870.10x = 4,305.42 × 1,138.50
4. Step 4: Simplify right side
   2,870.10x = 4,901,720.67
5. Step 5: Solve for x
   x = 4,901,720.67/2,870.10
6. Step 6: Final answer
   x = 1,707.86