Finding the Fourth Proportional to 1,667.61, 2,301.30 and 921.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.61 : 2,301.30 = 921.56 : x
2. Step 2: Convert to fraction form
   1,667.61/2,301.30 = 921.56/x
3. Step 3: Cross multiply
   1,667.61x = 2,301.30 × 921.56
4. Step 4: Simplify right side
   1,667.61x = 2,120,774.52
5. Step 5: Solve for x
   x = 2,120,774.52/1,667.61
6. Step 6: Final answer
   x = 1,271.74