Finding the Fourth Proportional to 1,113.89, 1,670.61 and 383.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.89 : 1,670.61 = 383.50 : x
2. Step 2: Convert to fraction form
   1,113.89/1,670.61 = 383.50/x
3. Step 3: Cross multiply
   1,113.89x = 1,670.61 × 383.50
4. Step 4: Simplify right side
   1,113.89x = 640,670.58
5. Step 5: Solve for x
   x = 640,670.58/1,113.89
6. Step 6: Final answer
   x = 575.17