Finding the Fourth Proportional to 1,666.94, 2,300.28 and 920.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.94 : 2,300.28 = 920.78 : x
2. Step 2: Convert to fraction form
   1,666.94/2,300.28 = 920.78/x
3. Step 3: Cross multiply
   1,666.94x = 2,300.28 × 920.78
4. Step 4: Simplify right side
   1,666.94x = 2,118,051.82
5. Step 5: Solve for x
   x = 2,118,051.82/1,666.94
6. Step 6: Final answer
   x = 1,270.62