Finding the Fourth Proportional to 1,667.80, 2,301.54 and 921.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.80 : 2,301.54 = 921.74 : x
2. Step 2: Convert to fraction form
   1,667.80/2,301.54 = 921.74/x
3. Step 3: Cross multiply
   1,667.80x = 2,301.54 × 921.74
4. Step 4: Simplify right side
   1,667.80x = 2,121,421.48
5. Step 5: Solve for x
   x = 2,121,421.48/1,667.80
6. Step 6: Final answer
   x = 1,271.99