Finding the Fourth Proportional to 1,215.50, 1,677.98 and 929.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.50 : 1,677.98 = 929.57 : x
2. Step 2: Convert to fraction form
   1,215.50/1,677.98 = 929.57/x
3. Step 3: Cross multiply
   1,215.50x = 1,677.98 × 929.57
4. Step 4: Simplify right side
   1,215.50x = 1,559,791.48
5. Step 5: Solve for x
   x = 1,559,791.48/1,215.50
6. Step 6: Final answer
   x = 1,283.26