Finding the Fourth Proportional to 1,672.19, 2,307.61 and 926.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.19 : 2,307.61 = 926.15 : x
2. Step 2: Convert to fraction form
   1,672.19/2,307.61 = 926.15/x
3. Step 3: Cross multiply
   1,672.19x = 2,307.61 × 926.15
4. Step 4: Simplify right side
   1,672.19x = 2,137,190.39
5. Step 5: Solve for x
   x = 2,137,190.39/1,672.19
6. Step 6: Final answer
   x = 1,278.08