Finding the Fourth Proportional to 1,578.76, 2,367.72 and 929.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.76 : 2,367.72 = 929.96 : x
2. Step 2: Convert to fraction form
   1,578.76/2,367.72 = 929.96/x
3. Step 3: Cross multiply
   1,578.76x = 2,367.72 × 929.96
4. Step 4: Simplify right side
   1,578.76x = 2,201,884.89
5. Step 5: Solve for x
   x = 2,201,884.89/1,578.76
6. Step 6: Final answer
   x = 1,394.69