Finding the Fourth Proportional to 1,677.60, 2,315.10 and 931.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.60 : 2,315.10 = 931.58 : x
2. Step 2: Convert to fraction form
   1,677.60/2,315.10 = 931.58/x
3. Step 3: Cross multiply
   1,677.60x = 2,315.10 × 931.58
4. Step 4: Simplify right side
   1,677.60x = 2,156,700.86
5. Step 5: Solve for x
   x = 2,156,700.86/1,677.60
6. Step 6: Final answer
   x = 1,285.59