Finding the Fourth Proportional to 1,667.16, 2,300.69 and 921.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.16 : 2,300.69 = 921.10 : x
2. Step 2: Convert to fraction form
   1,667.16/2,300.69 = 921.10/x
3. Step 3: Cross multiply
   1,667.16x = 2,300.69 × 921.10
4. Step 4: Simplify right side
   1,667.16x = 2,119,165.56
5. Step 5: Solve for x
   x = 2,119,165.56/1,667.16
6. Step 6: Final answer
   x = 1,271.12