Finding the Fourth Proportional to 1,111.21, 1,667.03 and 929.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.21 : 1,667.03 = 929.87 : x
2. Step 2: Convert to fraction form
   1,111.21/1,667.03 = 929.87/x
3. Step 3: Cross multiply
   1,111.21x = 1,667.03 × 929.87
4. Step 4: Simplify right side
   1,111.21x = 1,550,121.19
5. Step 5: Solve for x
   x = 1,550,121.19/1,111.21
6. Step 6: Final answer
   x = 1,394.98