Finding the Fourth Proportional to 1,187.32, 1,637.72 and 837.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,187.32 : 1,637.72 = 837.40 : x
2. Step 2: Convert to fraction form
   1,187.32/1,637.72 = 837.40/x
3. Step 3: Cross multiply
   1,187.32x = 1,637.72 × 837.40
4. Step 4: Simplify right side
   1,187.32x = 1,371,426.73
5. Step 5: Solve for x
   x = 1,371,426.73/1,187.32
6. Step 6: Final answer
   x = 1,155.06