Finding the Fourth Proportional to 1,887.40, 2,830.38 and 791.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,887.40 : 2,830.38 = 791.47 : x
2. Step 2: Convert to fraction form
   1,887.40/2,830.38 = 791.47/x
3. Step 3: Cross multiply
   1,887.40x = 2,830.38 × 791.47
4. Step 4: Simplify right side
   1,887.40x = 2,240,160.86
5. Step 5: Solve for x
   x = 2,240,160.86/1,887.40
6. Step 6: Final answer
   x = 1,186.90