Finding the Fourth Proportional to 1,539.15, 2,123.50 and 933.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,539.15 : 2,123.50 = 933.69 : x
2. Step 2: Convert to fraction form
   1,539.15/2,123.50 = 933.69/x
3. Step 3: Cross multiply
   1,539.15x = 2,123.50 × 933.69
4. Step 4: Simplify right side
   1,539.15x = 1,982,686.15
5. Step 5: Solve for x
   x = 1,982,686.15/1,539.15
6. Step 6: Final answer
   x = 1,288.17