Finding the Fourth Proportional to 1,667.15, 2,300.48 and 921.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.15 : 2,300.48 = 921.07 : x
2. Step 2: Convert to fraction form
   1,667.15/2,300.48 = 921.07/x
3. Step 3: Cross multiply
   1,667.15x = 2,300.48 × 921.07
4. Step 4: Simplify right side
   1,667.15x = 2,118,892.76
5. Step 5: Solve for x
   x = 2,118,892.76/1,667.15
6. Step 6: Final answer
   x = 1,270.97