Finding the Fourth Proportional to 1,666.91, 2,300.35 and 920.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.91 : 2,300.35 = 920.86 : x
2. Step 2: Convert to fraction form
   1,666.91/2,300.35 = 920.86/x
3. Step 3: Cross multiply
   1,666.91x = 2,300.35 × 920.86
4. Step 4: Simplify right side
   1,666.91x = 2,118,300.30
5. Step 5: Solve for x
   x = 2,118,300.30/1,666.91
6. Step 6: Final answer
   x = 1,270.79