Finding the Fourth Proportional to 1,428.05, 1,969.98 and 931.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.05 : 1,969.98 = 931.52 : x
2. Step 2: Convert to fraction form
   1,428.05/1,969.98 = 931.52/x
3. Step 3: Cross multiply
   1,428.05x = 1,969.98 × 931.52
4. Step 4: Simplify right side
   1,428.05x = 1,835,075.77
5. Step 5: Solve for x
   x = 1,835,075.77/1,428.05
6. Step 6: Final answer
   x = 1,285.02