Finding the Fourth Proportional to 13,071.72, 19,559.12 and 7,809.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,071.72 : 19,559.12 = 7,809.59 : x
2. Step 2: Convert to fraction form
   13,071.72/19,559.12 = 7,809.59/x
3. Step 3: Cross multiply
   13,071.72x = 19,559.12 × 7,809.59
4. Step 4: Simplify right side
   13,071.72x = 152,748,707.96
5. Step 5: Solve for x
   x = 152,748,707.96/13,071.72
6. Step 6: Final answer
   x = 11,685.43