Finding the Fourth Proportional to 13,231.35, 19,788.71 and 7,670.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,231.35 : 19,788.71 = 7,670.30 : x
2. Step 2: Convert to fraction form
   13,231.35/19,788.71 = 7,670.30/x
3. Step 3: Cross multiply
   13,231.35x = 19,788.71 × 7,670.30
4. Step 4: Simplify right side
   13,231.35x = 151,785,205.02
5. Step 5: Solve for x
   x = 151,785,205.02/13,231.35
6. Step 6: Final answer
   x = 11,471.63