Finding the Fourth Proportional to 1,434.78, 1,980.89 and 1,102.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.78 : 1,980.89 = 1,102.55 : x
2. Step 2: Convert to fraction form
   1,434.78/1,980.89 = 1,102.55/x
3. Step 3: Cross multiply
   1,434.78x = 1,980.89 × 1,102.55
4. Step 4: Simplify right side
   1,434.78x = 2,184,023.12
5. Step 5: Solve for x
   x = 2,184,023.12/1,434.78
6. Step 6: Final answer
   x = 1,522.20