Finding the Fourth Proportional to 1,397.30, 1,927.71 and 837.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.30 : 1,927.71 = 837.78 : x
2. Step 2: Convert to fraction form
   1,397.30/1,927.71 = 837.78/x
3. Step 3: Cross multiply
   1,397.30x = 1,927.71 × 837.78
4. Step 4: Simplify right side
   1,397.30x = 1,614,996.88
5. Step 5: Solve for x
   x = 1,614,996.88/1,397.30
6. Step 6: Final answer
   x = 1,155.80