Finding the Fourth Proportional to 3,912.91, 5,870.06 and 1,279.93

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.91 : 5,870.06 = 1,279.93 : x
2. Step 2: Convert to fraction form
   3,912.91/5,870.06 = 1,279.93/x
3. Step 3: Cross multiply
   3,912.91x = 5,870.06 × 1,279.93
4. Step 4: Simplify right side
   3,912.91x = 7,513,259.50
5. Step 5: Solve for x
   x = 7,513,259.50/3,912.91
6. Step 6: Final answer
   x = 1,920.12