Finding the Fourth Proportional to 1,781.88, 2,671.32 and 807.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,781.88 : 2,671.32 = 807.72 : x
2. Step 2: Convert to fraction form
   1,781.88/2,671.32 = 807.72/x
3. Step 3: Cross multiply
   1,781.88x = 2,671.32 × 807.72
4. Step 4: Simplify right side
   1,781.88x = 2,157,678.59
5. Step 5: Solve for x
   x = 2,157,678.59/1,781.88
6. Step 6: Final answer
   x = 1,210.90