Finding the Fourth Proportional to 2,780.84, 4,171.62 and 931.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.84 : 4,171.62 = 931.52 : x
2. Step 2: Convert to fraction form
   2,780.84/4,171.62 = 931.52/x
3. Step 3: Cross multiply
   2,780.84x = 4,171.62 × 931.52
4. Step 4: Simplify right side
   2,780.84x = 3,885,947.46
5. Step 5: Solve for x
   x = 3,885,947.46/2,780.84
6. Step 6: Final answer
   x = 1,397.40