Finding the Fourth Proportional to 1,127.41, 1,688.72 and 541.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.41 : 1,688.72 = 541.55 : x
2. Step 2: Convert to fraction form
   1,127.41/1,688.72 = 541.55/x
3. Step 3: Cross multiply
   1,127.41x = 1,688.72 × 541.55
4. Step 4: Simplify right side
   1,127.41x = 914,527.83
5. Step 5: Solve for x
   x = 914,527.83/1,127.41
6. Step 6: Final answer
   x = 811.18