Finding the Fourth Proportional to 1,501.38, 2,071.33 and 911.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.38 : 2,071.33 = 911.70 : x
2. Step 2: Convert to fraction form
   1,501.38/2,071.33 = 911.70/x
3. Step 3: Cross multiply
   1,501.38x = 2,071.33 × 911.70
4. Step 4: Simplify right side
   1,501.38x = 1,888,429.28
5. Step 5: Solve for x
   x = 1,888,429.28/1,501.38
6. Step 6: Final answer
   x = 1,257.80