Finding the Fourth Proportional to 2,117.78, 3,176.69 and 947.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.78 : 3,176.69 = 947.84 : x
2. Step 2: Convert to fraction form
   2,117.78/3,176.69 = 947.84/x
3. Step 3: Cross multiply
   2,117.78x = 3,176.69 × 947.84
4. Step 4: Simplify right side
   2,117.78x = 3,010,993.85
5. Step 5: Solve for x
   x = 3,010,993.85/2,117.78
6. Step 6: Final answer
   x = 1,421.77