Finding the Fourth Proportional to 1,131.60, 1,685.70 and 1,031.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.60 : 1,685.70 = 1,031.76 : x
2. Step 2: Convert to fraction form
   1,131.60/1,685.70 = 1,031.76/x
3. Step 3: Cross multiply
   1,131.60x = 1,685.70 × 1,031.76
4. Step 4: Simplify right side
   1,131.60x = 1,739,237.83
5. Step 5: Solve for x
   x = 1,739,237.83/1,131.60
6. Step 6: Final answer
   x = 1,536.97