Finding the Fourth Proportional to 1,356.17, 1,872.15 and 914.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.17 : 1,872.15 = 914.78 : x
2. Step 2: Convert to fraction form
   1,356.17/1,872.15 = 914.78/x
3. Step 3: Cross multiply
   1,356.17x = 1,872.15 × 914.78
4. Step 4: Simplify right side
   1,356.17x = 1,712,605.38
5. Step 5: Solve for x
   x = 1,712,605.38/1,356.17
6. Step 6: Final answer
   x = 1,262.82