Finding the Fourth Proportional to 1,917.69, 2,647.40 and 1,131.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.69 : 2,647.40 = 1,131.99 : x
2. Step 2: Convert to fraction form
   1,917.69/2,647.40 = 1,131.99/x
3. Step 3: Cross multiply
   1,917.69x = 2,647.40 × 1,131.99
4. Step 4: Simplify right side
   1,917.69x = 2,996,830.33
5. Step 5: Solve for x
   x = 2,996,830.33/1,917.69
6. Step 6: Final answer
   x = 1,562.73