Finding the Fourth Proportional to 1,667.81, 2,301.51 and 921.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.81 : 2,301.51 = 921.76 : x
2. Step 2: Convert to fraction form
   1,667.81/2,301.51 = 921.76/x
3. Step 3: Cross multiply
   1,667.81x = 2,301.51 × 921.76
4. Step 4: Simplify right side
   1,667.81x = 2,121,439.86
5. Step 5: Solve for x
   x = 2,121,439.86/1,667.81
6. Step 6: Final answer
   x = 1,271.99