Finding the Fourth Proportional to 1,355.67, 1,870.29 and 830.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.67 : 1,870.29 = 830.79 : x
2. Step 2: Convert to fraction form
   1,355.67/1,870.29 = 830.79/x
3. Step 3: Cross multiply
   1,355.67x = 1,870.29 × 830.79
4. Step 4: Simplify right side
   1,355.67x = 1,553,818.23
5. Step 5: Solve for x
   x = 1,553,818.23/1,355.67
6. Step 6: Final answer
   x = 1,146.16