Finding the Fourth Proportional to 1,061.12, 1,591.18 and 541.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.12 : 1,591.18 = 541.31 : x
2. Step 2: Convert to fraction form
   1,061.12/1,591.18 = 541.31/x
3. Step 3: Cross multiply
   1,061.12x = 1,591.18 × 541.31
4. Step 4: Simplify right side
   1,061.12x = 861,312.34
5. Step 5: Solve for x
   x = 861,312.34/1,061.12
6. Step 6: Final answer
   x = 811.70