Finding the Fourth Proportional to 3,931.72, 5,894.72 and 1,985.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.72 : 5,894.72 = 1,985.30 : x
2. Step 2: Convert to fraction form
   3,931.72/5,894.72 = 1,985.30/x
3. Step 3: Cross multiply
   3,931.72x = 5,894.72 × 1,985.30
4. Step 4: Simplify right side
   3,931.72x = 11,702,787.62
5. Step 5: Solve for x
   x = 11,702,787.62/3,931.72
6. Step 6: Final answer
   x = 2,976.51