Finding the Fourth Proportional to 12,113.39, 16,720.29 and 7,856.93

Step by Step Solution

1. Step 1: Write the proportion equation
   12,113.39 : 16,720.29 = 7,856.93 : x
2. Step 2: Convert to fraction form
   12,113.39/16,720.29 = 7,856.93/x
3. Step 3: Cross multiply
   12,113.39x = 16,720.29 × 7,856.93
4. Step 4: Simplify right side
   12,113.39x = 131,370,064.51
5. Step 5: Solve for x
   x = 131,370,064.51/12,113.39
6. Step 6: Final answer
   x = 10,845.03