Finding the Fourth Proportional to 3,385.82, 5,079.18 and 920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,385.82 : 5,079.18 = 920.72 : x
2. Step 2: Convert to fraction form
   3,385.82/5,079.18 = 920.72/x
3. Step 3: Cross multiply
   3,385.82x = 5,079.18 × 920.72
4. Step 4: Simplify right side
   3,385.82x = 4,676,502.61
5. Step 5: Solve for x
   x = 4,676,502.61/3,385.82
6. Step 6: Final answer
   x = 1,381.20