Finding the Fourth Proportional to 1,109.32, 1,663.98 and 379.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.32 : 1,663.98 = 379.42 : x
2. Step 2: Convert to fraction form
   1,109.32/1,663.98 = 379.42/x
3. Step 3: Cross multiply
   1,109.32x = 1,663.98 × 379.42
4. Step 4: Simplify right side
   1,109.32x = 631,347.29
5. Step 5: Solve for x
   x = 631,347.29/1,109.32
6. Step 6: Final answer
   x = 569.13