Finding the Fourth Proportional to 1,298.80, 1,789.76 and 925.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.80 : 1,789.76 = 925.12 : x
2. Step 2: Convert to fraction form
   1,298.80/1,789.76 = 925.12/x
3. Step 3: Cross multiply
   1,298.80x = 1,789.76 × 925.12
4. Step 4: Simplify right side
   1,298.80x = 1,655,733.82
5. Step 5: Solve for x
   x = 1,655,733.82/1,298.80
6. Step 6: Final answer
   x = 1,274.82