Finding the Fourth Proportional to 1,432.77, 1,978.10 and 1,100.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.77 : 1,978.10 = 1,100.55 : x
2. Step 2: Convert to fraction form
   1,432.77/1,978.10 = 1,100.55/x
3. Step 3: Cross multiply
   1,432.77x = 1,978.10 × 1,100.55
4. Step 4: Simplify right side
   1,432.77x = 2,176,997.96
5. Step 5: Solve for x
   x = 2,176,997.96/1,432.77
6. Step 6: Final answer
   x = 1,519.43