Finding the Fourth Proportional to 12,920.56, 17,833.15 and 7,883.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.56 : 17,833.15 = 7,883.70 : x
2. Step 2: Convert to fraction form
   12,920.56/17,833.15 = 7,883.70/x
3. Step 3: Cross multiply
   12,920.56x = 17,833.15 × 7,883.70
4. Step 4: Simplify right side
   12,920.56x = 140,591,214.51
5. Step 5: Solve for x
   x = 140,591,214.51/12,920.56
6. Step 6: Final answer
   x = 10,881.20