Finding the Fourth Proportional to 2,875.56, 4,312.89 and 928.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,875.56 : 4,312.89 = 928.23 : x
2. Step 2: Convert to fraction form
   2,875.56/4,312.89 = 928.23/x
3. Step 3: Cross multiply
   2,875.56x = 4,312.89 × 928.23
4. Step 4: Simplify right side
   2,875.56x = 4,003,353.88
5. Step 5: Solve for x
   x = 4,003,353.88/2,875.56
6. Step 6: Final answer
   x = 1,392.20