Finding the Fourth Proportional to 1,113.80, 1,667.04 and 929.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.80 : 1,667.04 = 929.96 : x
2. Step 2: Convert to fraction form
   1,113.80/1,667.04 = 929.96/x
3. Step 3: Cross multiply
   1,113.80x = 1,667.04 × 929.96
4. Step 4: Simplify right side
   1,113.80x = 1,550,280.52
5. Step 5: Solve for x
   x = 1,550,280.52/1,113.80
6. Step 6: Final answer
   x = 1,391.88