Finding the Fourth Proportional to 1,436.56, 2,151.80 and 916.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.56 : 2,151.80 = 916.88 : x
2. Step 2: Convert to fraction form
   1,436.56/2,151.80 = 916.88/x
3. Step 3: Cross multiply
   1,436.56x = 2,151.80 × 916.88
4. Step 4: Simplify right side
   1,436.56x = 1,972,942.38
5. Step 5: Solve for x
   x = 1,972,942.38/1,436.56
6. Step 6: Final answer
   x = 1,373.38