Finding the Fourth Proportional to 1,142.88, 1,715.64 and 914.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.88 : 1,715.64 = 914.56 : x
2. Step 2: Convert to fraction form
   1,142.88/1,715.64 = 914.56/x
3. Step 3: Cross multiply
   1,142.88x = 1,715.64 × 914.56
4. Step 4: Simplify right side
   1,142.88x = 1,569,055.72
5. Step 5: Solve for x
   x = 1,569,055.72/1,142.88
6. Step 6: Final answer
   x = 1,372.90