Finding the Fourth Proportional to 1,224.98, 1,692.78 and 929.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,224.98 : 1,692.78 = 929.72 : x
2. Step 2: Convert to fraction form
   1,224.98/1,692.78 = 929.72/x
3. Step 3: Cross multiply
   1,224.98x = 1,692.78 × 929.72
4. Step 4: Simplify right side
   1,224.98x = 1,573,811.42
5. Step 5: Solve for x
   x = 1,573,811.42/1,224.98
6. Step 6: Final answer
   x = 1,284.76