Finding the Fourth Proportional to 1,123.76, 1,686.06 and 474.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.76 : 1,686.06 = 474.32 : x
2. Step 2: Convert to fraction form
   1,123.76/1,686.06 = 474.32/x
3. Step 3: Cross multiply
   1,123.76x = 1,686.06 × 474.32
4. Step 4: Simplify right side
   1,123.76x = 799,723.55
5. Step 5: Solve for x
   x = 799,723.55/1,123.76
6. Step 6: Final answer
   x = 711.65