Finding the Fourth Proportional to 1,131.84, 1,561.50 and 837.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.84 : 1,561.50 = 837.72 : x
2. Step 2: Convert to fraction form
   1,131.84/1,561.50 = 837.72/x
3. Step 3: Cross multiply
   1,131.84x = 1,561.50 × 837.72
4. Step 4: Simplify right side
   1,131.84x = 1,308,099.78
5. Step 5: Solve for x
   x = 1,308,099.78/1,131.84
6. Step 6: Final answer
   x = 1,155.73