Finding the Fourth Proportional to 1,672.61, 2,308.10 and 926.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.61 : 2,308.10 = 926.51 : x
2. Step 2: Convert to fraction form
   1,672.61/2,308.10 = 926.51/x
3. Step 3: Cross multiply
   1,672.61x = 2,308.10 × 926.51
4. Step 4: Simplify right side
   1,672.61x = 2,138,461.56
5. Step 5: Solve for x
   x = 2,138,461.56/1,672.61
6. Step 6: Final answer
   x = 1,278.52