Finding the Fourth Proportional to 1,200.60, 1,800.63 and 1,142.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.60 : 1,800.63 = 1,142.10 : x
2. Step 2: Convert to fraction form
   1,200.60/1,800.63 = 1,142.10/x
3. Step 3: Cross multiply
   1,200.60x = 1,800.63 × 1,142.10
4. Step 4: Simplify right side
   1,200.60x = 2,056,499.52
5. Step 5: Solve for x
   x = 2,056,499.52/1,200.60
6. Step 6: Final answer
   x = 1,712.89