Finding the Fourth Proportional to 1,431.02, 1,978.47 and 1,100.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.02 : 1,978.47 = 1,100.54 : x
2. Step 2: Convert to fraction form
   1,431.02/1,978.47 = 1,100.54/x
3. Step 3: Cross multiply
   1,431.02x = 1,978.47 × 1,100.54
4. Step 4: Simplify right side
   1,431.02x = 2,177,375.48
5. Step 5: Solve for x
   x = 2,177,375.48/1,431.02
6. Step 6: Final answer
   x = 1,521.56