Finding the Fourth Proportional to 1,403.72, 2,102.34 and 1,355.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.72 : 2,102.34 = 1,355.12 : x
2. Step 2: Convert to fraction form
   1,403.72/2,102.34 = 1,355.12/x
3. Step 3: Cross multiply
   1,403.72x = 2,102.34 × 1,355.12
4. Step 4: Simplify right side
   1,403.72x = 2,848,922.98
5. Step 5: Solve for x
   x = 2,848,922.98/1,403.72
6. Step 6: Final answer
   x = 2,029.55