Finding the Fourth Proportional to 1,436, 2,153.76 and 614.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436 : 2,153.76 = 614.72 : x
2. Step 2: Convert to fraction form
   1,436/2,153.76 = 614.72/x
3. Step 3: Cross multiply
   1,436x = 2,153.76 × 614.72
4. Step 4: Simplify right side
   1,436x = 1,323,959.35
5. Step 5: Solve for x
   x = 1,323,959.35/1,436
6. Step 6: Final answer
   x = 921.98