Finding the Fourth Proportional to 13,333.41, 19,981.89 and 7,788.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,333.41 : 19,981.89 = 7,788.15 : x
2. Step 2: Convert to fraction form
   13,333.41/19,981.89 = 7,788.15/x
3. Step 3: Cross multiply
   13,333.41x = 19,981.89 × 7,788.15
4. Step 4: Simplify right side
   13,333.41x = 155,621,956.60
5. Step 5: Solve for x
   x = 155,621,956.60/13,333.41
6. Step 6: Final answer
   x = 11,671.58