Finding the Fourth Proportional to 2,590.80, 3,886.77 and 947.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,590.80 : 3,886.77 = 947.34 : x
2. Step 2: Convert to fraction form
   2,590.80/3,886.77 = 947.34/x
3. Step 3: Cross multiply
   2,590.80x = 3,886.77 × 947.34
4. Step 4: Simplify right side
   2,590.80x = 3,682,092.69
5. Step 5: Solve for x
   x = 3,682,092.69/2,590.80
6. Step 6: Final answer
   x = 1,421.22