Finding the Fourth Proportional to 1,780.06, 2,671.72 and 903.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.06 : 2,671.72 = 903.18 : x
2. Step 2: Convert to fraction form
   1,780.06/2,671.72 = 903.18/x
3. Step 3: Cross multiply
   1,780.06x = 2,671.72 × 903.18
4. Step 4: Simplify right side
   1,780.06x = 2,413,044.07
5. Step 5: Solve for x
   x = 2,413,044.07/1,780.06
6. Step 6: Final answer
   x = 1,355.60