Finding the Fourth Proportional to 1,309.52, 1,807.56 and 896.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.52 : 1,807.56 = 896.72 : x
2. Step 2: Convert to fraction form
   1,309.52/1,807.56 = 896.72/x
3. Step 3: Cross multiply
   1,309.52x = 1,807.56 × 896.72
4. Step 4: Simplify right side
   1,309.52x = 1,620,875.20
5. Step 5: Solve for x
   x = 1,620,875.20/1,309.52
6. Step 6: Final answer
   x = 1,237.76