Finding the Fourth Proportional to 1,781.16, 2,673.18 and 915.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,781.16 : 2,673.18 = 915.72 : x
2. Step 2: Convert to fraction form
   1,781.16/2,673.18 = 915.72/x
3. Step 3: Cross multiply
   1,781.16x = 2,673.18 × 915.72
4. Step 4: Simplify right side
   1,781.16x = 2,447,884.39
5. Step 5: Solve for x
   x = 2,447,884.39/1,781.16
6. Step 6: Final answer
   x = 1,374.32