Finding the Fourth Proportional to 1,672.63, 2,308.12 and 926.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.63 : 2,308.12 = 926.55 : x
2. Step 2: Convert to fraction form
   1,672.63/2,308.12 = 926.55/x
3. Step 3: Cross multiply
   1,672.63x = 2,308.12 × 926.55
4. Step 4: Simplify right side
   1,672.63x = 2,138,588.59
5. Step 5: Solve for x
   x = 2,138,588.59/1,672.63
6. Step 6: Final answer
   x = 1,278.58