Finding the Fourth Proportional to 1,131.35, 1,557.50 and 836.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.35 : 1,557.50 = 836.10 : x
2. Step 2: Convert to fraction form
   1,131.35/1,557.50 = 836.10/x
3. Step 3: Cross multiply
   1,131.35x = 1,557.50 × 836.10
4. Step 4: Simplify right side
   1,131.35x = 1,302,221.57
5. Step 5: Solve for x
   x = 1,302,221.57/1,131.35
6. Step 6: Final answer
   x = 1,151.04