Finding the Fourth Proportional to 1,677.60, 2,315.17 and 931.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.60 : 2,315.17 = 931.56 : x
2. Step 2: Convert to fraction form
   1,677.60/2,315.17 = 931.56/x
3. Step 3: Cross multiply
   1,677.60x = 2,315.17 × 931.56
4. Step 4: Simplify right side
   1,677.60x = 2,156,720.03
5. Step 5: Solve for x
   x = 2,156,720.03/1,677.60
6. Step 6: Final answer
   x = 1,285.60