Finding the Fourth Proportional to 1,415.17, 1,951.35 and 917.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.17 : 1,951.35 = 917.15 : x
2. Step 2: Convert to fraction form
   1,415.17/1,951.35 = 917.15/x
3. Step 3: Cross multiply
   1,415.17x = 1,951.35 × 917.15
4. Step 4: Simplify right side
   1,415.17x = 1,789,680.65
5. Step 5: Solve for x
   x = 1,789,680.65/1,415.17
6. Step 6: Final answer
   x = 1,264.64