Finding the Fourth Proportional to 1,500.76, 2,071.20 and 911.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,500.76 : 2,071.20 = 911.35 : x
2. Step 2: Convert to fraction form
   1,500.76/2,071.20 = 911.35/x
3. Step 3: Cross multiply
   1,500.76x = 2,071.20 × 911.35
4. Step 4: Simplify right side
   1,500.76x = 1,887,588.12
5. Step 5: Solve for x
   x = 1,887,588.12/1,500.76
6. Step 6: Final answer
   x = 1,257.75