Finding the Fourth Proportional to 1,411.47, 2,117.72 and 917.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.47 : 2,117.72 = 917.84 : x
2. Step 2: Convert to fraction form
   1,411.47/2,117.72 = 917.84/x
3. Step 3: Cross multiply
   1,411.47x = 2,117.72 × 917.84
4. Step 4: Simplify right side
   1,411.47x = 1,943,728.12
5. Step 5: Solve for x
   x = 1,943,728.12/1,411.47
6. Step 6: Final answer
   x = 1,377.09