Finding the Fourth Proportional to 13,085.36, 18,056.72 and 7,781.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.36 : 18,056.72 = 7,781.52 : x
2. Step 2: Convert to fraction form
   13,085.36/18,056.72 = 7,781.52/x
3. Step 3: Cross multiply
   13,085.36x = 18,056.72 × 7,781.52
4. Step 4: Simplify right side
   13,085.36x = 140,508,727.81
5. Step 5: Solve for x
   x = 140,508,727.81/13,085.36
6. Step 6: Final answer
   x = 10,737.86