Finding the Fourth Proportional to 2,070.16, 2,856.96 and 1,138.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.16 : 2,856.96 = 1,138.72 : x
2. Step 2: Convert to fraction form
   2,070.16/2,856.96 = 1,138.72/x
3. Step 3: Cross multiply
   2,070.16x = 2,856.96 × 1,138.72
4. Step 4: Simplify right side
   2,070.16x = 3,253,277.49
5. Step 5: Solve for x
   x = 3,253,277.49/2,070.16
6. Step 6: Final answer
   x = 1,571.51