Finding the Fourth Proportional to 1,913.72, 2,640.47 and 1,116.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.72 : 2,640.47 = 1,116.81 : x
2. Step 2: Convert to fraction form
   1,913.72/2,640.47 = 1,116.81/x
3. Step 3: Cross multiply
   1,913.72x = 2,640.47 × 1,116.81
4. Step 4: Simplify right side
   1,913.72x = 2,948,897.72
5. Step 5: Solve for x
   x = 2,948,897.72/1,913.72
6. Step 6: Final answer
   x = 1,540.93