Finding the Fourth Proportional to 1,131.48, 1,558.17 and 781.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.48 : 1,558.17 = 781.56 : x
2. Step 2: Convert to fraction form
   1,131.48/1,558.17 = 781.56/x
3. Step 3: Cross multiply
   1,131.48x = 1,558.17 × 781.56
4. Step 4: Simplify right side
   1,131.48x = 1,217,803.35
5. Step 5: Solve for x
   x = 1,217,803.35/1,131.48
6. Step 6: Final answer
   x = 1,076.29