Finding the Fourth Proportional to 2,870.91, 4,302.18 and 1,225.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.91 : 4,302.18 = 1,225.13 : x
2. Step 2: Convert to fraction form
   2,870.91/4,302.18 = 1,225.13/x
3. Step 3: Cross multiply
   2,870.91x = 4,302.18 × 1,225.13
4. Step 4: Simplify right side
   2,870.91x = 5,270,708.27
5. Step 5: Solve for x
   x = 5,270,708.27/2,870.91
6. Step 6: Final answer
   x = 1,835.90