Finding the Fourth Proportional to 1,521.48, 2,099.40 and 931.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.48 : 2,099.40 = 931.86 : x
2. Step 2: Convert to fraction form
   1,521.48/2,099.40 = 931.86/x
3. Step 3: Cross multiply
   1,521.48x = 2,099.40 × 931.86
4. Step 4: Simplify right side
   1,521.48x = 1,956,346.88
5. Step 5: Solve for x
   x = 1,956,346.88/1,521.48
6. Step 6: Final answer
   x = 1,285.82