Finding the Fourth Proportional to 1,780.18, 2,455.89 and 1,072.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.18 : 2,455.89 = 1,072.02 : x
2. Step 2: Convert to fraction form
   1,780.18/2,455.89 = 1,072.02/x
3. Step 3: Cross multiply
   1,780.18x = 2,455.89 × 1,072.02
4. Step 4: Simplify right side
   1,780.18x = 2,632,763.62
5. Step 5: Solve for x
   x = 2,632,763.62/1,780.18
6. Step 6: Final answer
   x = 1,478.93