Finding the Fourth Proportional to 1,320.72, 1,823.43 and 901.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.72 : 1,823.43 = 901.77 : x
2. Step 2: Convert to fraction form
   1,320.72/1,823.43 = 901.77/x
3. Step 3: Cross multiply
   1,320.72x = 1,823.43 × 901.77
4. Step 4: Simplify right side
   1,320.72x = 1,644,314.47
5. Step 5: Solve for x
   x = 1,644,314.47/1,320.72
6. Step 6: Final answer
   x = 1,245.01