Finding the Fourth Proportional to 1,667.91, 2,301.51 and 921.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.91 : 2,301.51 = 921.87 : x
2. Step 2: Convert to fraction form
   1,667.91/2,301.51 = 921.87/x
3. Step 3: Cross multiply
   1,667.91x = 2,301.51 × 921.87
4. Step 4: Simplify right side
   1,667.91x = 2,121,693.02
5. Step 5: Solve for x
   x = 2,121,693.02/1,667.91
6. Step 6: Final answer
   x = 1,272.07