Finding the Fourth Proportional to 1,436.69, 2,155.56 and 742.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.69 : 2,155.56 = 742.91 : x
2. Step 2: Convert to fraction form
   1,436.69/2,155.56 = 742.91/x
3. Step 3: Cross multiply
   1,436.69x = 2,155.56 × 742.91
4. Step 4: Simplify right side
   1,436.69x = 1,601,386.79
5. Step 5: Solve for x
   x = 1,601,386.79/1,436.69
6. Step 6: Final answer
   x = 1,114.64