Finding the Fourth Proportional to 2,871.69, 4,307.64 and 791.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,871.69 : 4,307.64 = 791.86 : x
2. Step 2: Convert to fraction form
   2,871.69/4,307.64 = 791.86/x
3. Step 3: Cross multiply
   2,871.69x = 4,307.64 × 791.86
4. Step 4: Simplify right side
   2,871.69x = 3,411,047.81
5. Step 5: Solve for x
   x = 3,411,047.81/2,871.69
6. Step 6: Final answer
   x = 1,187.82