Finding the Fourth Proportional to 1,877.37, 2,815.83 and 781.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,877.37 : 2,815.83 = 781.59 : x
2. Step 2: Convert to fraction form
   1,877.37/2,815.83 = 781.59/x
3. Step 3: Cross multiply
   1,877.37x = 2,815.83 × 781.59
4. Step 4: Simplify right side
   1,877.37x = 2,200,824.57
5. Step 5: Solve for x
   x = 2,200,824.57/1,877.37
6. Step 6: Final answer
   x = 1,172.29