Finding the Fourth Proportional to 1,913.76, 2,640.72 and 1,117.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.76 : 2,640.72 = 1,117.34 : x
2. Step 2: Convert to fraction form
   1,913.76/2,640.72 = 1,117.34/x
3. Step 3: Cross multiply
   1,913.76x = 2,640.72 × 1,117.34
4. Step 4: Simplify right side
   1,913.76x = 2,950,568.88
5. Step 5: Solve for x
   x = 2,950,568.88/1,913.76
6. Step 6: Final answer
   x = 1,541.77