Finding the Fourth Proportional to 1,428.52, 1,971.34 and 807.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.52 : 1,971.34 = 807.52 : x
2. Step 2: Convert to fraction form
   1,428.52/1,971.34 = 807.52/x
3. Step 3: Cross multiply
   1,428.52x = 1,971.34 × 807.52
4. Step 4: Simplify right side
   1,428.52x = 1,591,896.48
5. Step 5: Solve for x
   x = 1,591,896.48/1,428.52
6. Step 6: Final answer
   x = 1,114.37