Finding the Fourth Proportional to 2,875.69, 4,312.93 and 928.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,875.69 : 4,312.93 = 928.05 : x
2. Step 2: Convert to fraction form
   2,875.69/4,312.93 = 928.05/x
3. Step 3: Cross multiply
   2,875.69x = 4,312.93 × 928.05
4. Step 4: Simplify right side
   2,875.69x = 4,002,614.69
5. Step 5: Solve for x
   x = 4,002,614.69/2,875.69
6. Step 6: Final answer
   x = 1,391.88