Finding the Fourth Proportional to 1,491.28, 2,056.98 and 900.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.28 : 2,056.98 = 900.70 : x
2. Step 2: Convert to fraction form
   1,491.28/2,056.98 = 900.70/x
3. Step 3: Cross multiply
   1,491.28x = 2,056.98 × 900.70
4. Step 4: Simplify right side
   1,491.28x = 1,852,721.89
5. Step 5: Solve for x
   x = 1,852,721.89/1,491.28
6. Step 6: Final answer
   x = 1,242.37